Description: revert upstream bugfix (see:https://github.com/Microsoft/cpprestsdk/issues/1090)
Last-Update: 2019-03-28

--- cpprest-2.10.12.orig/Release/include/cpprest/asyncrt_utils.h
+++ cpprest-2.10.12/Release/include/cpprest/asyncrt_utils.h
@@ -630,6 +630,15 @@ private:
     static const interval_type _hourTicks = 60 * 60 * _secondTicks;
     static const interval_type _dayTicks = 24 * 60 * 60 * _secondTicks;
 
+#ifdef _WIN32
+    // void* to avoid pulling in windows.h
+    static _ASYNCRTIMP bool __cdecl system_type_to_datetime(/*SYSTEMTIME*/ void* psysTime,
+                                                            uint64_t seconds,
+                                                            datetime* pdt);
+#else
+    static datetime timeval_to_datetime(const timeval& time);
+#endif
+
     // Private constructor. Use static methods to create an instance.
     datetime(interval_type interval) : m_interval(interval) {}
 
@@ -690,6 +699,7 @@ public:
     void set_length(int length) { m_length = length; }
 
 private:
+    static const utility::string_t c_allowed_chars;
     std::mt19937 m_random;
     int m_length;
 };
--- cpprest-2.10.12.orig/Release/src/pch/stdafx.h
+++ cpprest-2.10.12/Release/src/pch/stdafx.h
@@ -61,6 +61,7 @@
 #undef BOOST_NO_CXX11_NULLPTR
 #endif
 #include "boost/bind/bind.hpp"
+#include "boost/date_time/posix_time/posix_time_types.hpp"
 #include "boost/thread/condition_variable.hpp"
 #include "boost/thread/mutex.hpp"
 #include <fcntl.h>
--- cpprest-2.10.12.orig/Release/src/utilities/asyncrt_utils.cpp
+++ cpprest-2.10.12/Release/src/utilities/asyncrt_utils.cpp
@@ -15,9 +15,20 @@
 
 #include <algorithm>
 #include <cpprest/asyncrt_utils.h>
-#include <stdexcept>
+#include <sstream>
 #include <string>
-#include <time.h>
+
+#ifndef _WIN32
+#if defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-local-typedef"
+#endif
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/date_time/posix_time/posix_time_io.hpp>
+#if defined(__clang__)
+#pragma clang diagnostic pop
+#endif
+#endif
 
 using namespace web;
 using namespace utility;
@@ -618,7 +629,18 @@ std::string __cdecl conversions::to_utf8
 
 utf16string __cdecl conversions::to_utf16string(const std::string& value) { return utf8_to_utf16(value); }
 
-static const uint64_t ntToUnixOffsetSeconds = 11644473600U; // diff between windows and unix epochs (seconds)
+#ifndef WIN32
+datetime datetime::timeval_to_datetime(const timeval& time)
+{
+    const uint64_t epoch_offset = 11644473600LL; // diff between windows and unix epochs (seconds)
+    uint64_t result = epoch_offset + time.tv_sec;
+    result *= _secondTicks;      // convert to 10e-7
+    result += time.tv_usec * 10; // convert and add microseconds, 10e-6 to 10e-7
+    return datetime(result);
+}
+#endif
+
+static bool is_digit(utility::char_t c) { return c >= _XPLATSTR('0') && c <= _XPLATSTR('9'); }
 
 datetime __cdecl datetime::utc_now()
 {
@@ -634,649 +656,450 @@ datetime __cdecl datetime::utc_now()
 #else // LINUX
     struct timeval time;
     gettimeofday(&time, nullptr);
-    uint64_t result = ntToUnixOffsetSeconds + time.tv_sec;
-    result *= _secondTicks;      // convert to 10e-7
-    result += time.tv_usec * 10; // convert and add microseconds, 10e-6 to 10e-7
-    return datetime(result);
+    return timeval_to_datetime(time);
 #endif
 }
 
-static const char dayNames[] = "Sun\0Mon\0Tue\0Wed\0Thu\0Fri\0Sat";
-static const char monthNames[] = "Jan\0Feb\0Mar\0Apr\0May\0Jun\0Jul\0Aug\0Sep\0Oct\0Nov\0Dec";
-
 utility::string_t datetime::to_string(date_format format) const
 {
-    const uint64_t input = m_interval / _secondTicks; // convert to seconds
-    const int frac_sec = static_cast<int>(m_interval % _secondTicks);
-    const time_t time = static_cast<time_t>(input - ntToUnixOffsetSeconds);
-    struct tm t;
-#ifdef _MSC_VER
-    if (gmtime_s(&t, &time) != 0)
-#else  // ^^^ _MSC_VER ^^^ // vvv !_MSC_VER vvv
-    if (gmtime_r(&time, &t) == 0)
-#endif // _MSC_VER
-    {
-        throw std::invalid_argument("gmtime_r/s failed on the time supplied");
-    }
-
-    char outBuffer[38]; // Thu, 01 Jan 1970 00:00:00 GMT\0
-                        // 1970-01-01T00:00:00.1234567Z\0
-    char* outCursor = outBuffer;
-    switch (format)
-    {
-        case RFC_1123:
-#ifdef _MSC_VER
-            sprintf_s(outCursor,
-                      26,
-                      "%s, %02d %s %04d %02d:%02d:%02d",
-                      dayNames + 4 * t.tm_wday,
-                      t.tm_mday,
-                      monthNames + 4 * t.tm_mon,
-                      t.tm_year + 1900,
-                      t.tm_hour,
-                      t.tm_min,
-                      t.tm_sec);
-#else  // ^^^ _MSC_VER // !_MSC_VER vvv
-            sprintf(outCursor,
-                    "%s, %02d %s %04d %02d:%02d:%02d",
-                    dayNames + 4 * t.tm_wday,
-                    t.tm_mday,
-                    monthNames + 4 * t.tm_mon,
-                    t.tm_year + 1900,
-                    t.tm_hour,
-                    t.tm_min,
-                    t.tm_sec);
-#endif // _MSC_VER
-            outCursor += 25;
-            memcpy(outCursor, " GMT", 4);
-            outCursor += 4;
-            return utility::string_t(outBuffer, outCursor);
-        case ISO_8601:
-#ifdef _MSC_VER
-            sprintf_s(outCursor,
-                      20,
-                      "%04d-%02d-%02dT%02d:%02d:%02d",
-                      t.tm_year + 1900,
-                      t.tm_mon + 1,
-                      t.tm_mday,
-                      t.tm_hour,
-                      t.tm_min,
-                      t.tm_sec);
-#else  // ^^^ _MSC_VER // !_MSC_VER vvv
-            sprintf(outCursor,
-                    "%04d-%02d-%02dT%02d:%02d:%02d",
-                    t.tm_year + 1900,
-                    t.tm_mon + 1,
-                    t.tm_mday,
-                    t.tm_hour,
-                    t.tm_min,
-                    t.tm_sec);
-#endif // _MSC_VER
-            outCursor += 19;
-            if (frac_sec != 0)
-            {
-                // Append fractional second, which is a 7-digit value with no trailing zeros
-                // This way, '1200' becomes '00012'
-#ifdef _MSC_VER
-                size_t appended = sprintf_s(outCursor, 9, ".%07d", frac_sec);
-#else  // ^^^ _MSC_VER // !_MSC_VER vvv
-                size_t appended = sprintf(outCursor, ".%07d", frac_sec);
-#endif // _MSC_VER
-                while (outCursor[appended - 1] == '0')
-                {
-                    --appended; // trim trailing zeros
-                }
-
-                outCursor += appended;
-            }
-
-            *outCursor = 'Z';
-            ++outCursor;
-            return utility::string_t(outBuffer, outCursor);
-        default: throw std::invalid_argument("Unrecognized date format.");
-    }
-}
-
-template<class CharT>
-static bool string_starts_with(const CharT* haystack, const char* needle)
-{
-    while (*needle)
-    {
-        if (*haystack != static_cast<CharT>(*needle))
-        {
-            return false;
-        }
-
-        ++haystack;
-        ++needle;
-    }
-
-    return true;
-}
-
-#define ascii_isdigit(c) ((unsigned char)((unsigned char)(c) - '0') <= 9)
-#define ascii_isdigit6(c) ((unsigned char)((unsigned char)(c) - '0') <= 6)
-#define ascii_isdigit5(c) ((unsigned char)((unsigned char)(c) - '0') <= 5)
-#define ascii_isdigit3(c) ((unsigned char)((unsigned char)(c) - '0') <= 3)
-#define ascii_isdigit2(c) ((unsigned char)((unsigned char)(c) - '0') <= 2)
-#define ascii_isdigit1(c) ((unsigned char)((unsigned char)(c) - '0') <= 1)
-
-static const unsigned char max_days_in_month[12] = {
-    31, // Jan
-    00, // Feb, special handling for leap years
-    31, // Mar
-    30, // Apr
-    31, // May
-    30, // Jun
-    31, // Jul
-    31, // Aug
-    30, // Sep
-    31, // Oct
-    30, // Nov
-    31  // Dec
-};
-
-static bool validate_day_month(int day, int month, int year)
-{
-    int maxDaysThisMonth;
-    if (month == 1)
-    { // Feb needs leap year testing
-        maxDaysThisMonth = 28 + (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
-    }
-    else
-    {
-        maxDaysThisMonth = max_days_in_month[month];
-    }
-
-    return day >= 1 && day <= maxDaysThisMonth;
-}
+#ifdef _WIN32
+    int status;
 
-template<class CharT>
-static int atoi2(const CharT* str)
-{
-    return (static_cast<unsigned char>(str[0]) - '0') * 10 + (static_cast<unsigned char>(str[1]) - '0');
-}
+    ULARGE_INTEGER largeInt;
+    largeInt.QuadPart = m_interval;
 
-static const time_t maxTimeT = sizeof(time_t) == 4 ? (time_t)INT_MAX : (time_t)LLONG_MAX;
+    FILETIME ft;
+    ft.dwHighDateTime = largeInt.HighPart;
+    ft.dwLowDateTime = largeInt.LowPart;
 
-static time_t timezone_adjust(time_t result, unsigned char chSign, int adjustHours, int adjustMinutes)
-{
-    if (adjustHours > 23)
+    SYSTEMTIME systemTime;
+    if (!FileTimeToSystemTime((const FILETIME*)&ft, &systemTime))
     {
-        return (time_t)-1;
+        throw utility::details::create_system_error(GetLastError());
     }
 
-    // adjustMinutes > 59 is impossible due to digit 5 check
-    const int tzAdjust = adjustMinutes * 60 + adjustHours * 60 * 60;
-    if (chSign == '-')
+    std::wstring result;
+    if (format == RFC_1123)
     {
-        if (maxTimeT - result < tzAdjust)
         {
-            return (time_t)-1;
+            wchar_t dateStr[18] = {0};
+#if _WIN32_WINNT < _WIN32_WINNT_VISTA
+            status = GetDateFormatW(
+                LOCALE_INVARIANT, 0, &systemTime, L"ddd',' dd MMM yyyy", dateStr, sizeof(dateStr) / sizeof(wchar_t));
+#else
+            status = GetDateFormatEx(LOCALE_NAME_INVARIANT,
+                                     0,
+                                     &systemTime,
+                                     L"ddd',' dd MMM yyyy",
+                                     dateStr,
+                                     sizeof(dateStr) / sizeof(wchar_t),
+                                     NULL);
+#endif // _WIN32_WINNT < _WIN32_WINNT_VISTA
+            if (status == 0)
+            {
+                throw utility::details::create_system_error(GetLastError());
+            }
+
+            result += dateStr;
+            result += L' ';
         }
 
-        result += tzAdjust;
-    }
-    else
-    {
-        if (tzAdjust > result)
         {
-            return (time_t)-1;
-        }
-
-        result -= tzAdjust;
-    }
-
-    return result;
-}
-
-static time_t make_gm_time(struct tm* t)
-{
-#ifdef _MSC_VER
-    return _mkgmtime(t);
-#elif (defined(ANDROID) || defined(__ANDROID__))
-    // HACK: The (nonportable?) POSIX function timegm is not available in
-    //       bionic. As a workaround[1][2], we set the C library timezone to
-    //       UTC, call mktime, then set the timezone back. However, the C
-    //       environment is fundamentally a shared global resource and thread-
-    //       unsafe. We can protect our usage here, however any other code might
-    //       manipulate the environment at the same time.
-    //
-    // [1] http://linux.die.net/man/3/timegm
-    // [2] http://www.gnu.org/software/libc/manual/html_node/Broken_002ddown-Time.html
-    time_t time;
-    static boost::mutex env_var_lock;
-    {
-        boost::lock_guard<boost::mutex> lock(env_var_lock);
-        std::string prev_env;
-        auto prev_env_cstr = getenv("TZ");
-        if (prev_env_cstr != nullptr)
-        {
-            prev_env = prev_env_cstr;
-        }
-        setenv("TZ", "UTC", 1);
-
-        time = mktime(t);
+            wchar_t timeStr[10] = {0};
+#if _WIN32_WINNT < _WIN32_WINNT_VISTA
+            status = GetTimeFormatW(LOCALE_INVARIANT,
+                                    TIME_NOTIMEMARKER | TIME_FORCE24HOURFORMAT,
+                                    &systemTime,
+                                    L"HH':'mm':'ss",
+                                    timeStr,
+                                    sizeof(timeStr) / sizeof(wchar_t));
+#else
+            status = GetTimeFormatEx(LOCALE_NAME_INVARIANT,
+                                     TIME_NOTIMEMARKER | TIME_FORCE24HOURFORMAT,
+                                     &systemTime,
+                                     L"HH':'mm':'ss",
+                                     timeStr,
+                                     sizeof(timeStr) / sizeof(wchar_t));
+#endif // _WIN32_WINNT < _WIN32_WINNT_VISTA
+            if (status == 0)
+            {
+                throw utility::details::create_system_error(GetLastError());
+            }
 
-        if (prev_env_cstr)
-        {
-            setenv("TZ", prev_env.c_str(), 1);
-        }
-        else
-        {
-            unsetenv("TZ");
+            result += timeStr;
+            result += L" GMT";
         }
     }
-    return time;
-#else  // ^^^ ANDROID // Other POSIX platforms vvv
-    return timegm(t);
-#endif // _MSC_VER
-}
-
-/*
-https://tools.ietf.org/html/rfc822
-https://tools.ietf.org/html/rfc1123
-
-date-time   =  [ day "," ] date time        ; dd mm yy
-                                            ;  hh:mm:ss zzz
-
-day         =  "Mon"  / "Tue" /  "Wed"  / "Thu"
-            /  "Fri"  / "Sat" /  "Sun"
-
-date        =  1*2DIGIT month 2DIGIT        ; day month year
-                                            ;  e.g. 20 Jun 82
-RFC1123 changes this to:
-date        =  1*2DIGIT month 2*4DIGIT        ; day month year
-                                              ;  e.g. 20 Jun 1982
-This implementation only accepts 4 digit years.
-
-month       =  "Jan"  /  "Feb" /  "Mar"  /  "Apr"
-            /  "May"  /  "Jun" /  "Jul"  /  "Aug"
-            /  "Sep"  /  "Oct" /  "Nov"  /  "Dec"
-
-time        =  hour zone                    ; ANSI and Military
-
-hour        =  2DIGIT ":" 2DIGIT [":" 2DIGIT]
-                                            ; 00:00:00 - 23:59:59
-
-zone        =  "UT"  / "GMT"                ; Universal Time
-                                            ; North American : UT
-            /  "EST" / "EDT"                ;  Eastern:  - 5/ - 4
-            /  "CST" / "CDT"                ;  Central:  - 6/ - 5
-            /  "MST" / "MDT"                ;  Mountain: - 7/ - 6
-            /  "PST" / "PDT"                ;  Pacific:  - 8/ - 7
-
-// military time deleted by RFC 1123
-
-            / ( ("+" / "-") 4DIGIT )        ; Local differential
-                                            ;  hours+min. (HHMM)
-*/
-
-
-datetime __cdecl datetime::from_string(const utility::string_t& dateString, date_format format)
-{
-    datetime result;
-    time_t seconds;
-    uint64_t frac_sec = 0;
-    struct tm t{};
-    auto str = dateString.c_str();
-    if (format == RFC_1123)
+    else if (format == ISO_8601)
     {
-        int parsedWeekday = -1;
-        for (int day = 0; day < 7; ++day)
+        const size_t buffSize = 64;
         {
-            if (string_starts_with(str, dayNames + day * 4) && str[3] == _XPLATSTR(',') && str[4] == _XPLATSTR(' '))
+            wchar_t dateStr[buffSize] = {0};
+#if _WIN32_WINNT < _WIN32_WINNT_VISTA
+            status = GetDateFormatW(LOCALE_INVARIANT, 0, &systemTime, L"yyyy-MM-dd", dateStr, buffSize);
+#else
+            status = GetDateFormatEx(LOCALE_NAME_INVARIANT, 0, &systemTime, L"yyyy-MM-dd", dateStr, buffSize, NULL);
+#endif // _WIN32_WINNT < _WIN32_WINNT_VISTA
+            if (status == 0)
             {
-                parsedWeekday = day;
-                str += 5; // parsed day of week
-                break;
+                throw utility::details::create_system_error(GetLastError());
             }
-        }
 
-        if (ascii_isdigit3(str[0]) && ascii_isdigit(str[1]) && str[2] == _XPLATSTR(' '))
-        {
-            t.tm_mday = atoi2(str); // validity checked later
-            str += 3;               // parsed day
-        }
-        else if (ascii_isdigit(str[0]) && str[1] == _XPLATSTR(' '))
-        {
-            t.tm_mday = str[0] - _XPLATSTR('0');
-            str += 2; // parsed day
-        }
-        else
-        {
-            return result;
+            result += dateStr;
+            result += L'T';
         }
 
-        t.tm_mon = -1;
-        for (int month = 0; month < 12; ++month)
         {
-            if (string_starts_with(str, monthNames + month * 4))
+            wchar_t timeStr[buffSize] = {0};
+#if _WIN32_WINNT < _WIN32_WINNT_VISTA
+            status = GetTimeFormatW(LOCALE_INVARIANT,
+                                    TIME_NOTIMEMARKER | TIME_FORCE24HOURFORMAT,
+                                    &systemTime,
+                                    L"HH':'mm':'ss",
+                                    timeStr,
+                                    buffSize);
+#else
+            status = GetTimeFormatEx(LOCALE_NAME_INVARIANT,
+                                     TIME_NOTIMEMARKER | TIME_FORCE24HOURFORMAT,
+                                     &systemTime,
+                                     L"HH':'mm':'ss",
+                                     timeStr,
+                                     buffSize);
+#endif // _WIN32_WINNT < _WIN32_WINNT_VISTA
+            if (status == 0)
             {
-                t.tm_mon = month;
-                break;
+                throw utility::details::create_system_error(GetLastError());
             }
-        }
 
-        if (t.tm_mon == -1 || str[3] != _XPLATSTR(' '))
-        {
-            return result;
+            result += timeStr;
         }
 
-        str += 4; // parsed month
-
-        if (!ascii_isdigit3(str[0]) || !ascii_isdigit(str[1]) || !ascii_isdigit(str[2]) || !ascii_isdigit(str[3]) ||
-            str[4] != ' ')
+        uint64_t frac_sec = largeInt.QuadPart % _secondTicks;
+        if (frac_sec > 0)
         {
-            return result;
+            // Append fractional second, which is a 7-digit value with no trailing zeros
+            // This way, '1200' becomes '00012'
+            wchar_t buf[9] = {0};
+            size_t appended = swprintf_s(buf, 9, L".%07ld", static_cast<long>(frac_sec));
+            while (buf[appended - 1] == L'0')
+                --appended; // trim trailing zeros
+            result.append(buf, appended);
         }
 
-        t.tm_year = (str[0] - _XPLATSTR('0')) * 1000 + (str[1] - _XPLATSTR('0')) * 100 +
-                    (str[2] - _XPLATSTR('0')) * 10 + (str[3] - _XPLATSTR('0'));
-        if (t.tm_year < 1970 || t.tm_year > 3000)
-        {
-            return result;
-        }
+        result += L'Z';
+    }
 
-        // days in month validity check
-        if (!validate_day_month(t.tm_mday, t.tm_mon, t.tm_year))
-        {
-            return result;
-        }
+    return result;
+#else // LINUX
+    uint64_t input = m_interval;
+    uint64_t frac_sec = input % _secondTicks;
+    input /= _secondTicks;                               // convert to seconds
+    time_t time = (time_t)input - (time_t)11644473600LL; // diff between windows and unix epochs (seconds)
+
+    struct tm datetime;
+    gmtime_r(&time, &datetime);
+
+    const int max_dt_length = 64;
+    char output[max_dt_length + 1] = {0};
+
+    if (format != RFC_1123 && frac_sec > 0)
+    {
+        // Append fractional second, which is a 7-digit value with no trailing zeros
+        // This way, '1200' becomes '00012'
+        const int max_frac_length = 8;
+        char buf[max_frac_length + 1] = {0};
+        snprintf(buf, sizeof(buf), ".%07ld", (long int)frac_sec);
+        // trim trailing zeros
+        for (int i = max_frac_length - 1; buf[i] == '0'; i--)
+            buf[i] = '\0';
+        // format the datetime into a separate buffer
+        char datetime_str[max_dt_length - max_frac_length - 1 + 1] = {0};
+        strftime(datetime_str, sizeof(datetime_str), "%Y-%m-%dT%H:%M:%S", &datetime);
+        // now print this buffer into the output buffer
+        snprintf(output, sizeof(output), "%s%sZ", datetime_str, buf);
+    }
+    else
+    {
+        strftime(
+            output, sizeof(output), format == RFC_1123 ? "%a, %d %b %Y %H:%M:%S GMT" : "%Y-%m-%dT%H:%M:%SZ", &datetime);
+    }
 
-        t.tm_year -= 1900;
-        str += 5; // parsed year
+    return std::string(output);
+#endif
+}
 
-        if (!ascii_isdigit2(str[0]) || !ascii_isdigit(str[1]) || str[2] != _XPLATSTR(':') || !ascii_isdigit5(str[3]) ||
-            !ascii_isdigit(str[4]))
-        {
-            return result;
-        }
+#ifdef _WIN32
+bool __cdecl datetime::system_type_to_datetime(void* pvsysTime, uint64_t seconds, datetime* pdt)
+{
+    SYSTEMTIME* psysTime = (SYSTEMTIME*)pvsysTime;
+    FILETIME fileTime;
 
-        t.tm_hour = atoi2(str);
-        if (t.tm_hour > 23)
-        {
-            return result;
-        }
+    if (SystemTimeToFileTime(psysTime, &fileTime))
+    {
+        ULARGE_INTEGER largeInt;
+        largeInt.LowPart = fileTime.dwLowDateTime;
+        largeInt.HighPart = fileTime.dwHighDateTime;
 
-        str += 3; // parsed hour
-        t.tm_min = atoi2(str);
-        str += 2; // parsed mins
+        // Add hundredths of nanoseconds
+        largeInt.QuadPart += seconds;
 
-        if (str[0] == ':')
-        {
-            if (!ascii_isdigit6(str[1]) || !ascii_isdigit(str[2]) || str[3] != _XPLATSTR(' '))
-            {
-                return result;
-            }
+        *pdt = datetime(largeInt.QuadPart);
+        return true;
+    }
+    return false;
+}
+#endif
 
-            t.tm_sec = atoi2(str + 1);
-            str += 4; // parsed seconds
-        }
-        else if (str[0] == _XPLATSTR(' '))
-        {
-            t.tm_sec = 0;
-            str += 1; // parsed seconds
-        }
-        else
-        {
-            return result;
+// Take a string that represents a fractional second and return the number of ticks
+// This is equivalent to doing atof on the string and multiplying by 10000000,
+// but does not lose precision
+template<typename StringIterator>
+uint64_t timeticks_from_second(StringIterator begin, StringIterator end)
+{
+    int size = (int)(end - begin);
+    _ASSERTE(begin[0] == U('.'));
+    uint64_t ufrac_second = 0;
+    for (int i = 1; i <= 7; ++i)
+    {
+        ufrac_second *= 10;
+        int add = i < size ? begin[i] - U('0') : 0;
+        ufrac_second += add;
+    }
+    return ufrac_second;
+}
+
+void extract_fractional_second(const utility::string_t& dateString,
+                               utility::string_t& resultString,
+                               uint64_t& ufrac_second)
+{
+    resultString = dateString;
+    // First, the string must be strictly longer than 2 characters, and the trailing character must be 'Z'
+    if (resultString.size() > 2 && resultString[resultString.size() - 1] == U('Z'))
+    {
+        // Second, find the last non-digit by scanning the string backwards
+        auto last_non_digit = std::find_if_not(resultString.rbegin() + 1, resultString.rend(), is_digit);
+        if (last_non_digit < resultString.rend() - 1)
+        {
+            // Finally, make sure the last non-digit is a dot:
+            auto last_dot = last_non_digit.base() - 1;
+            if (*last_dot == U('.'))
+            {
+                // Got it! Now extract the fractional second
+                auto last_before_Z = std::end(resultString) - 1;
+                ufrac_second = timeticks_from_second(last_dot, last_before_Z);
+                // And erase it from the string
+                resultString.erase(last_dot, last_before_Z);
+            }
         }
+    }
+}
 
-        if (t.tm_sec > 60)
-        { // 60 to allow leap seconds
-            return result;
-        }
+datetime __cdecl datetime::from_string(const utility::string_t& dateString, date_format format)
+{
+    // avoid floating point math to preserve precision
+    uint64_t ufrac_second = 0;
 
-        t.tm_isdst = 0;
-        seconds = make_gm_time(&t);
-        if (seconds < 0)
-        {
-            return result;
-        }
+#ifdef _WIN32
+    datetime result;
+    if (format == RFC_1123)
+    {
+        SYSTEMTIME sysTime = {0};
 
-        if (parsedWeekday >= 0 && parsedWeekday != t.tm_wday)
-        {
-            return result;
-        }
+        std::wstring month(3, L'\0');
+        std::wstring unused(3, L'\0');
 
-        if (!string_starts_with(str, "GMT") && !string_starts_with(str, "UT"))
-        {
-            // some timezone adjustment necessary
-            auto tzCh = _XPLATSTR('-');
-            int tzHours;
-            int tzMinutes = 0;
-            if (string_starts_with(str, "EDT"))
-            {
-                tzHours = 4;
-            }
-            else if (string_starts_with(str, "EST") || string_starts_with(str, "CDT"))
-            {
-                tzHours = 5;
-            }
-            else if (string_starts_with(str, "CST") || string_starts_with(str, "MDT"))
-            {
-                tzHours = 6;
-            }
-            else if (string_starts_with(str, "MST") || string_starts_with(str, "PDT"))
-            {
-                tzHours = 7;
-            }
-            else if (string_starts_with(str, "PST"))
-            {
-                tzHours = 8;
-            }
-            else if ((tzCh == _XPLATSTR('+') || tzCh == _XPLATSTR('-')) && ascii_isdigit2(str[1]) &&
-                     ascii_isdigit(str[2]) && ascii_isdigit5(str[3]) && ascii_isdigit(str[4]))
-            {
-                tzCh = str[0];
-                tzHours = atoi2(str + 1);
-                tzMinutes = atoi2(str + 3);
-            }
-            else
-            {
-                return result;
-            }
+        const wchar_t* formatString = L"%3c, %2d %3c %4d %2d:%2d:%2d %3c";
+        auto n = swscanf_s(dateString.c_str(),
+                           formatString,
+                           unused.data(),
+                           unused.size(),
+                           &sysTime.wDay,
+                           month.data(),
+                           month.size(),
+                           &sysTime.wYear,
+                           &sysTime.wHour,
+                           &sysTime.wMinute,
+                           &sysTime.wSecond,
+                           unused.data(),
+                           unused.size());
+
+        if (n == 8)
+        {
+            std::wstring monthnames[12] = {
+                L"Jan", L"Feb", L"Mar", L"Apr", L"May", L"Jun", L"Jul", L"Aug", L"Sep", L"Oct", L"Nov", L"Dec"};
+            auto loc =
+                std::find_if(monthnames, monthnames + 12, [&month](const std::wstring& m) { return m == month; });
 
-            seconds = timezone_adjust(seconds, static_cast<unsigned char>(tzCh), tzHours, tzMinutes);
-            if (seconds < 0)
+            if (loc != monthnames + 12)
             {
-                return result;
+                sysTime.wMonth = (short)((loc - monthnames) + 1);
+                if (system_type_to_datetime(&sysTime, ufrac_second, &result))
+                {
+                    return result;
+                }
             }
         }
     }
     else if (format == ISO_8601)
     {
-        // parse year
-        if (!ascii_isdigit3(str[0]) || !ascii_isdigit(str[1]) || !ascii_isdigit(str[2]) || !ascii_isdigit(str[3]))
-        {
-            return result;
-        }
+        // Unlike FILETIME, SYSTEMTIME does not have enough precision to hold seconds in 100 nanosecond
+        // increments. Therefore, start with seconds and milliseconds set to 0, then add them separately
 
-        t.tm_year = (str[0] - _XPLATSTR('0')) * 1000 + (str[1] - _XPLATSTR('0')) * 100 +
-                    (str[2] - _XPLATSTR('0')) * 10 + (str[3] - _XPLATSTR('0'));
-        if (t.tm_year < 1970 || t.tm_year > 3000)
-        {
-            return result;
-        }
+        // Try to extract the fractional second from the timestamp
+        utility::string_t input;
+        extract_fractional_second(dateString, input, ufrac_second);
+        {
+            SYSTEMTIME sysTime = {0};
+            const wchar_t* formatString = L"%4d-%2d-%2dT%2d:%2d:%2dZ";
+            auto n = swscanf_s(input.c_str(),
+                               formatString,
+                               &sysTime.wYear,
+                               &sysTime.wMonth,
+                               &sysTime.wDay,
+                               &sysTime.wHour,
+                               &sysTime.wMinute,
+                               &sysTime.wSecond);
 
-        str += 4;
-        if (*str == _XPLATSTR('-'))
-        {
-            ++str;
+            if (n == 3 || n == 6)
+            {
+                if (system_type_to_datetime(&sysTime, ufrac_second, &result))
+                {
+                    return result;
+                }
+            }
         }
-
-        // parse month
-        if (!ascii_isdigit1(str[0]) || !ascii_isdigit(str[1]))
         {
-            return result;
-        }
+            SYSTEMTIME sysTime = {0};
+            DWORD date = 0;
 
-        t.tm_mon = atoi2(str);
-        if (t.tm_mon < 1 || t.tm_mon > 12)
-        {
-            return result;
-        }
-
-        t.tm_mon -= 1;
-        str += 2;
+            const wchar_t* formatString = L"%8dT%2d:%2d:%2dZ";
+            auto n = swscanf_s(input.c_str(), formatString, &date, &sysTime.wHour, &sysTime.wMinute, &sysTime.wSecond);
 
-        if (*str == _XPLATSTR('-'))
-        {
-            ++str;
-        }
+            if (n == 1 || n == 4)
+            {
+                sysTime.wDay = date % 100;
+                date /= 100;
+                sysTime.wMonth = date % 100;
+                date /= 100;
+                sysTime.wYear = (WORD)date;
 
-        // parse day
-        if (!ascii_isdigit3(str[0]) || !ascii_isdigit(str[1]))
-        {
-            return result;
+                if (system_type_to_datetime(&sysTime, ufrac_second, &result))
+                {
+                    return result;
+                }
+            }
         }
-
-        t.tm_mday = atoi2(str);
-        if (!validate_day_month(t.tm_mday, t.tm_mon, t.tm_year))
         {
-            return result;
-        }
+            SYSTEMTIME sysTime = {0};
+            GetSystemTime(&sysTime); // Fill date portion with today's information
+            sysTime.wSecond = 0;
+            sysTime.wMilliseconds = 0;
 
-        t.tm_year -= 1900;
-        str += 2;
+            const wchar_t* formatString = L"%2d:%2d:%2dZ";
+            auto n = swscanf_s(input.c_str(), formatString, &sysTime.wHour, &sysTime.wMinute, &sysTime.wSecond);
 
-        if (str[0] != _XPLATSTR('T') && str[0] != _XPLATSTR('t'))
-        {
-            // No time
-            seconds = make_gm_time(&t);
-            if (seconds < 0)
+            if (n == 3)
             {
-                return result;
+                if (system_type_to_datetime(&sysTime, ufrac_second, &result))
+                {
+                    return result;
+                }
             }
-
-            seconds += ntToUnixOffsetSeconds;
-            result.m_interval = static_cast<interval_type>(seconds) * _secondTicks;
-            return result;
         }
+    }
 
-        ++str; // skip 'T'
+    return datetime();
+#else
+    std::string input(dateString);
 
-        // parse hour
-        if (!ascii_isdigit2(str[0]) || !ascii_isdigit(str[1]))
-        {
-            return result;
-        }
+    struct tm output = tm();
 
-        t.tm_hour = atoi2(str);
-        str += 2;
-        if (t.tm_hour > 23)
-        {
-            return result;
-        }
+    if (format == RFC_1123)
+    {
+        strptime(input.data(), "%a, %d %b %Y %H:%M:%S GMT", &output);
+    }
+    else
+    {
+        // Try to extract the fractional second from the timestamp
+        utility::string_t input;
+        extract_fractional_second(dateString, input, ufrac_second);
 
-        if (*str == _XPLATSTR(':'))
-        {
-            ++str;
-        }
+        auto result = strptime(input.data(), "%Y-%m-%dT%H:%M:%SZ", &output);
 
-        // parse minute
-        if (!ascii_isdigit5(str[0]) || !ascii_isdigit(str[1]))
+        if (result == nullptr)
         {
-            return result;
+            result = strptime(input.data(), "%Y%m%dT%H:%M:%SZ", &output);
         }
-        t.tm_min = atoi2(str);
-        // t.tm_min > 59 is impossible because we checked that the first digit is <= 5 in the basic format
-        // check above
-
-        str += 2;
-
-        if (*str == _XPLATSTR(':'))
+        if (result == nullptr)
         {
-            ++str;
+            // Fill the date portion with the epoch,
+            // strptime will do the rest
+            memset(&output, 0, sizeof(struct tm));
+            output.tm_year = 70;
+            output.tm_mon = 1;
+            output.tm_mday = 1;
+            result = strptime(input.data(), "%H:%M:%SZ", &output);
         }
-
-        // parse seconds
-        if (!ascii_isdigit6(str[0]) || !ascii_isdigit(str[1]))
+        if (result == nullptr)
         {
-            return result;
+            result = strptime(input.data(), "%Y-%m-%d", &output);
         }
-
-        t.tm_sec = atoi2(str);
-        // We allow 60 to account for leap seconds
-        if (t.tm_sec > 60)
+        if (result == nullptr)
         {
-            return result;
+            result = strptime(input.data(), "%Y%m%d", &output);
         }
-
-        str += 2;
-        if (str[0] == _XPLATSTR('.') && ascii_isdigit(str[1]))
+        if (result == nullptr)
         {
-            ++str;
-            int digits = 7;
-            for (;;)
-            {
-                frac_sec *= 10;
-                frac_sec += *str - _XPLATSTR('0');
-                --digits;
-                ++str;
-                if (digits == 0)
-                {
-                    while (ascii_isdigit(*str))
-                    {
-                        // consume remaining fractional second digits we can't use
-                        ++str;
-                    }
-
-                    break;
-                }
-
-                if (!ascii_isdigit(*str))
-                {
-                    // no more digits in the input, do the remaining multiplies we need
-                    for (; digits != 0; --digits)
-                    {
-                        frac_sec *= 10;
-                    }
-
-                    break;
-                }
-            }
+            return datetime();
         }
+    }
 
-        seconds = make_gm_time(&t);
-        if (seconds < 0)
-        {
-            return result;
-        }
+#if (defined(ANDROID) || defined(__ANDROID__))
+    // HACK: The (nonportable?) POSIX function timegm is not available in
+    //       bionic. As a workaround[1][2], we set the C library timezone to
+    //       UTC, call mktime, then set the timezone back. However, the C
+    //       environment is fundamentally a shared global resource and thread-
+    //       unsafe. We can protect our usage here, however any other code might
+    //       manipulate the environment at the same time.
+    //
+    // [1] http://linux.die.net/man/3/timegm
+    // [2] http://www.gnu.org/software/libc/manual/html_node/Broken_002ddown-Time.html
+    time_t time;
 
-        if (str[0] == _XPLATSTR('Z') || str[0] == _XPLATSTR('z'))
+    static boost::mutex env_var_lock;
+    {
+        boost::lock_guard<boost::mutex> lock(env_var_lock);
+        std::string prev_env;
+        auto prev_env_cstr = getenv("TZ");
+        if (prev_env_cstr != nullptr)
         {
-            // no adjustment needed for zulu time
+            prev_env = prev_env_cstr;
         }
-        else if (str[0] == _XPLATSTR('+') || str[0] == _XPLATSTR('-'))
-        {
-            const unsigned char offsetDirection = static_cast<unsigned char>(str[0]);
-            if (!ascii_isdigit2(str[1]) || !ascii_isdigit(str[2]) || str[3] != _XPLATSTR(':') ||
-                !ascii_isdigit5(str[4]) || !ascii_isdigit(str[5]))
-            {
-                return result;
-            }
+        setenv("TZ", "UTC", 1);
 
-            seconds = timezone_adjust(seconds, offsetDirection, atoi2(str + 1), atoi2(str + 4));
-            if (seconds < 0)
-            {
-                return result;
-            }
+        time = mktime(&output);
+
+        if (prev_env_cstr)
+        {
+            setenv("TZ", prev_env.c_str(), 1);
         }
         else
         {
-            // the timezone is malformed, but cpprestsdk currently accepts this as no timezone
+            unsetenv("TZ");
         }
     }
-    else
-    {
-        throw std::invalid_argument("unrecognized date format");
-    }
+#else
+    time_t time = timegm(&output);
+#endif
+
+    struct timeval tv = timeval();
+    tv.tv_sec = time;
+    auto result = timeval_to_datetime(tv);
 
-    seconds += ntToUnixOffsetSeconds;
-    result.m_interval = static_cast<interval_type>(seconds) * _secondTicks + frac_sec;
+    // fractional seconds are already in correct format so just add them.
+    result = result + ufrac_second;
     return result;
+#endif
 }
 
 /// <summary>
@@ -1358,32 +1181,38 @@ utility::seconds __cdecl timespan::xml_d
     // The final S could be omitted
 
     int64_t numSecs = 0;
-    auto cursor = timespanString.c_str();
-    auto c = *cursor++; // skip 'P'
-    while (c)
+
+    utility::istringstream_t is(timespanString);
+    is.imbue(std::locale::classic());
+    auto eof = std::char_traits<utility::char_t>::eof();
+
+    std::basic_istream<utility::char_t>::int_type c;
+    c = is.get(); // P
+
+    while (c != eof)
     {
         int val = 0;
-        c = *cursor++;
+        c = is.get();
 
-        while (ascii_isdigit(c))
+        while (is_digit((utility::char_t)c))
         {
-            val = val * 10 + (c - _XPLATSTR('0'));
-            c = *cursor++;
+            val = val * 10 + (c - L'0');
+            c = is.get();
 
-            if (c == _XPLATSTR('.'))
+            if (c == '.')
             {
                 // decimal point is not handled
                 do
                 {
-                    c = *cursor++;
-                } while (ascii_isdigit(c));
+                    c = is.get();
+                } while (is_digit((utility::char_t)c));
             }
         }
 
-        if (c == _XPLATSTR('D')) numSecs += val * 24 * 3600; // days
-        if (c == _XPLATSTR('H')) numSecs += val * 3600;      // Hours
-        if (c == _XPLATSTR('M')) numSecs += val * 60;        // Minutes
-        if (c == _XPLATSTR('S') || c == _XPLATSTR('\0'))
+        if (c == L'D') numSecs += val * 24 * 3600; // days
+        if (c == L'H') numSecs += val * 3600;      // Hours
+        if (c == L'M') numSecs += val * 60;        // Minutes
+        if (c == L'S' || c == eof)
         {
             numSecs += val; // seconds
             break;
@@ -1393,12 +1222,12 @@ utility::seconds __cdecl timespan::xml_d
     return utility::seconds(numSecs);
 }
 
-static const utility::char_t c_allowed_chars[] =
-    _XPLATSTR("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");
+const utility::string_t nonce_generator::c_allowed_chars(
+    _XPLATSTR("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"));
 
 utility::string_t nonce_generator::generate()
 {
-    std::uniform_int_distribution<> distr(0, static_cast<int>(sizeof(c_allowed_chars) / sizeof(utility::char_t)) - 1);
+    std::uniform_int_distribution<> distr(0, static_cast<int>(c_allowed_chars.length() - 1));
     utility::string_t result;
     result.reserve(length());
     std::generate_n(std::back_inserter(result), length(), [&]() { return c_allowed_chars[distr(m_random)]; });
--- cpprest-2.10.12.orig/Release/tests/functional/utils/datetime.cpp
+++ cpprest-2.10.12/Release/tests/functional/utils/datetime.cpp
@@ -74,6 +74,16 @@ SUITE(datetime)
         }
     }
 
+    TEST(parsing_time_extended)
+    {
+        // ISO 8601
+        {
+            auto dt = utility::datetime::from_string(_XPLATSTR("14:30:01Z"), utility::datetime::ISO_8601);
+
+            VERIFY_ARE_NOT_EQUAL(0u, dt.to_interval());
+        }
+    }
+
     void TestDateTimeRoundtrip(utility::string_t str, utility::string_t strExpected)
     {
         auto dt = utility::datetime::from_string(str, utility::datetime::ISO_8601);
@@ -91,8 +101,6 @@ SUITE(datetime)
 
     TEST(parsing_time_roundtrip_datetime2)
     {
-        // lose the last '000'
-        TestDateTimeRoundtrip(_XPLATSTR("2013-11-19T14:30:59.1234567000Z"), _XPLATSTR("2013-11-19T14:30:59.1234567Z"));
         // lose the last '999' without rounding up
         TestDateTimeRoundtrip(_XPLATSTR("2013-11-19T14:30:59.1234567999Z"), _XPLATSTR("2013-11-19T14:30:59.1234567Z"));
     }
@@ -121,260 +129,16 @@ SUITE(datetime)
         TestDateTimeRoundtrip(_XPLATSTR("2013-11-19T14:30:59.5Z"));
     }
 
-    void TestRfc1123IsTimeT(const utility::char_t* str, time_t t)
-    {
-        datetime dt = datetime::from_string(str, utility::datetime::RFC_1123);
-        uint64_t interval = dt.to_interval();
-        VERIFY_ARE_EQUAL(0, interval % 10000000);
-        interval /= 10000000;
-        interval -= 11644473600; // NT epoch adjustment
-        VERIFY_ARE_EQUAL(static_cast<uint64_t>(t), interval);
-    }
-
-    TEST(parsing_time_rfc1123_accepts_each_day)
-    {
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 00:00:00 GMT"), (time_t) 0);
-        TestRfc1123IsTimeT(_XPLATSTR("Fri, 02 Jan 1970 00:00:00 GMT"), (time_t) 86400 * 1);
-        TestRfc1123IsTimeT(_XPLATSTR("Sat, 03 Jan 1970 00:00:00 GMT"), (time_t) 86400 * 2);
-        TestRfc1123IsTimeT(_XPLATSTR("Sun, 04 Jan 1970 00:00:00 GMT"), (time_t) 86400 * 3);
-        TestRfc1123IsTimeT(_XPLATSTR("Mon, 05 Jan 1970 00:00:00 GMT"), (time_t) 86400 * 4);
-        TestRfc1123IsTimeT(_XPLATSTR("Tue, 06 Jan 1970 00:00:00 GMT"), (time_t) 86400 * 5);
-        TestRfc1123IsTimeT(_XPLATSTR("Wed, 07 Jan 1970 00:00:00 GMT"), (time_t) 86400 * 6);
-    }
-
-    TEST(parsing_time_rfc1123_boundary_cases)
-    {
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 00:00:00 GMT"), (time_t) 0);
-        TestRfc1123IsTimeT(_XPLATSTR("19 Jan 2038 03:14:06 GMT"), (time_t) INT_MAX - 1);
-#ifndef _USE_32BIT_TIME_T
-        TestRfc1123IsTimeT(_XPLATSTR("19 Jan 2038 03:13:07 -0001"), (time_t) INT_MAX);
-        TestRfc1123IsTimeT(_XPLATSTR("19 Jan 2038 03:14:07 -0000"), (time_t) INT_MAX);
-#endif // _USE_32BIT_TIME_T
-        TestRfc1123IsTimeT(_XPLATSTR("14 Jan 2019 23:16:21 +0000"), (time_t) 1547507781);
-        TestRfc1123IsTimeT(_XPLATSTR("14 Jan 2019 23:16:21 -0001"), (time_t) 1547507841);
-        TestRfc1123IsTimeT(_XPLATSTR("14 Jan 2019 23:16:21 +0001"), (time_t) 1547507721);
-        TestRfc1123IsTimeT(_XPLATSTR("14 Jan 2019 23:16:21 -0100"), (time_t) 1547511381);
-        TestRfc1123IsTimeT(_XPLATSTR("14 Jan 2019 23:16:21 +0100"), (time_t) 1547504181);
-    }
-
-    TEST(parsing_time_rfc1123_uses_each_field)
-    {
-        TestRfc1123IsTimeT(_XPLATSTR("02 Jan 1970 00:00:00 GMT"), (time_t) 86400);
-        TestRfc1123IsTimeT(_XPLATSTR("12 Jan 1970 00:00:00 GMT"), (time_t) 950400);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Feb 1970 00:00:00 GMT"), (time_t) 2678400);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 2000 00:00:00 GMT"), (time_t) 946684800);
-#ifndef _USE_32BIT_TIME_T
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 2100 00:00:00 GMT"), (time_t) 4102444800);
-#endif // _USE_32BIT_TIME_T
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1990 00:00:00 GMT"), (time_t) 631152000);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1971 00:00:00 GMT"), (time_t) 31536000);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 10:00:00 GMT"), (time_t) 36000);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 01:00:00 GMT"), (time_t) 3600);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 00:10:00 GMT"), (time_t) 600);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 00:01:00 GMT"), (time_t) 60);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 00:00:10 GMT"), (time_t) 10);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 00:00:01 GMT"), (time_t) 1);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 10:00:00 GMT"), (time_t) 36000);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 02:00:00 PST"), (time_t) 36000);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 03:00:00 PDT"), (time_t) 36000);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 03:00:00 MST"), (time_t) 36000);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 04:00:00 MDT"), (time_t) 36000);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 04:00:00 CST"), (time_t) 36000);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 05:00:00 CDT"), (time_t) 36000);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 05:00:00 EST"), (time_t) 36000);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 06:00:00 EDT"), (time_t) 36000);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 06:00:00 -0400"), (time_t) 36000);
-        TestRfc1123IsTimeT(_XPLATSTR("01 Jan 1970 05:59:00 -0401"), (time_t) 36000);
-    }
-
-    TEST(parsing_time_rfc1123_max_days)
-    {
-        TestRfc1123IsTimeT(_XPLATSTR("31 Jan 1970 00:00:00 GMT"), (time_t) 2592000);
-        TestRfc1123IsTimeT(_XPLATSTR("28 Feb 2019 00:00:00 GMT"), (time_t) 1551312000); // non leap year allows feb 28
-        TestRfc1123IsTimeT(_XPLATSTR("29 Feb 2020 00:00:00 GMT"), (time_t) 1582934400); // leap year allows feb 29
-        TestRfc1123IsTimeT(_XPLATSTR("31 Mar 1970 00:00:00 GMT"), (time_t) 7689600);
-        TestRfc1123IsTimeT(_XPLATSTR("30 Apr 1970 00:00:00 GMT"), (time_t) 10281600);
-        TestRfc1123IsTimeT(_XPLATSTR("31 May 1970 00:00:00 GMT"), (time_t) 12960000);
-        TestRfc1123IsTimeT(_XPLATSTR("30 Jun 1970 00:00:00 GMT"), (time_t) 15552000);
-        TestRfc1123IsTimeT(_XPLATSTR("31 Jul 1970 00:00:00 GMT"), (time_t) 18230400);
-        TestRfc1123IsTimeT(_XPLATSTR("31 Aug 1970 00:00:00 GMT"), (time_t) 20908800);
-        TestRfc1123IsTimeT(_XPLATSTR("30 Sep 1970 00:00:00 GMT"), (time_t) 23500800);
-        TestRfc1123IsTimeT(_XPLATSTR("31 Oct 1970 00:00:00 GMT"), (time_t) 26179200);
-        TestRfc1123IsTimeT(_XPLATSTR("30 Nov 1970 00:00:00 GMT"), (time_t) 28771200);
-        TestRfc1123IsTimeT(_XPLATSTR("31 Dec 1970 00:00:00 GMT"), (time_t) 31449600);
-    }
-
-    TEST(parsing_time_rfc1123_invalid_cases)
-    {
-        const utility::string_t bad_strings[] = {
-            _XPLATSTR("Ahu, 01 Jan 1970 00:00:00 GMT"), // bad letters in each place
-            _XPLATSTR("TAu, 01 Jan 1970 00:00:00 GMT"),
-            _XPLATSTR("ThA, 01 Jan 1970 00:00:00 GMT"),
-            _XPLATSTR("ThuA 01 Jan 1970 00:00:00 GMT"),
-            _XPLATSTR("Thu,A01 Jan 1970 00:00:00 GMT"),
-            _XPLATSTR("Thu, A1 Jan 1970 00:00:00 GMT"),
-            _XPLATSTR("Thu, 0A Jan 1970 00:00:00 GMT"),
-            _XPLATSTR("Thu, 01AJan 1970 00:00:00 GMT"),
-            _XPLATSTR("Thu, 01 Aan 1970 00:00:00 GMT"),
-            _XPLATSTR("Thu, 01 JAn 1970 00:00:00 GMT"),
-            _XPLATSTR("Thu, 01 JaA 1970 00:00:00 GMT"),
-            _XPLATSTR("Thu, 01 JanA1970 00:00:00 GMT"),
-            _XPLATSTR("Thu, 01 Jan A970 00:00:00 GMT"),
-            _XPLATSTR("Thu, 01 Jan 1A70 00:00:00 GMT"),
-            _XPLATSTR("Thu, 01 Jan 19A0 00:00:00 GMT"),
-            _XPLATSTR("Thu, 01 Jan 197A 00:00:00 GMT"),
-            _XPLATSTR("Thu, 01 Jan 1970A00:00:00 GMT"),
-            _XPLATSTR("Thu, 01 Jan 1970 A0:00:00 GMT"),
-            _XPLATSTR("Thu, 01 Jan 1970 0A:00:00 GMT"),
-            _XPLATSTR("Thu, 01 Jan 1970 00A00:00 GMT"),
-            _XPLATSTR("Thu, 01 Jan 1970 00:A0:00 GMT"),
-            _XPLATSTR("Thu, 01 Jan 1970 00:0A:00 GMT"),
-            _XPLATSTR("Thu, 01 Jan 1970 00:00A00 GMT"),
-            _XPLATSTR("Thu, 01 Jan 1970 00:00:A0 GMT"),
-            _XPLATSTR("Thu, 01 Jan 1970 00:00:0A GMT"),
-            _XPLATSTR("Thu, 01 Jan 1970 00:00:00AGMT"),
-            _XPLATSTR("Thu, 01 Jan 1970 00:00:00 AMT"),
-            _XPLATSTR("Thu, 01 Jan 1970 00:00:00 GAT"),
-            _XPLATSTR("Thu, 01 Jan 1970 00:00:00 GMA"),
-            _XPLATSTR(""), // truncation
-            _XPLATSTR("T"),
-            _XPLATSTR("Th"),
-            _XPLATSTR("Thu"),
-            _XPLATSTR("Thu,"),
-            _XPLATSTR("Thu, "),
-            _XPLATSTR("Thu, 0"),
-            _XPLATSTR("Thu, 01"),
-            _XPLATSTR("Thu, 01 "),
-            _XPLATSTR("Thu, 01 J"),
-            _XPLATSTR("Thu, 01 Ja"),
-            _XPLATSTR("Thu, 01 Jan"),
-            _XPLATSTR("Thu, 01 Jan "),
-            _XPLATSTR("Thu, 01 Jan 1"),
-            _XPLATSTR("Thu, 01 Jan 19"),
-            _XPLATSTR("Thu, 01 Jan 197"),
-            _XPLATSTR("Thu, 01 Jan 1970"),
-            _XPLATSTR("Thu, 01 Jan 1970 "),
-            _XPLATSTR("Thu, 01 Jan 1970 0"),
-            _XPLATSTR("Thu, 01 Jan 1970 00"),
-            _XPLATSTR("Thu, 01 Jan 1970 00:"),
-            _XPLATSTR("Thu, 01 Jan 1970 00:0"),
-            _XPLATSTR("Thu, 01 Jan 1970 00:00"),
-            _XPLATSTR("Thu, 01 Jan 1970 00:00:"),
-            _XPLATSTR("Thu, 01 Jan 1970 00:00:0"),
-            _XPLATSTR("Thu, 01 Jan 1970 00:00:00"),
-            _XPLATSTR("Thu, 01 Jan 1970 00:00:00 "),
-            _XPLATSTR("Thu, 01 Jan 1970 00:00:00 G"),
-            _XPLATSTR("Thu, 01 Jan 1970 00:00:00 GM"),
-            _XPLATSTR("Fri, 01 Jan 1970 00:00:00 GMT"), // wrong day
-            _XPLATSTR("01 Jan 4970 00:00:00 GMT"), // year too big
-            _XPLATSTR("01 Jan 3001 00:00:00 GMT"),
-            _XPLATSTR("01 Xxx 1971 00:00:00 GMT"), // month bad
-            _XPLATSTR("00 Jan 1971 00:00:00 GMT"), // day too small
-            _XPLATSTR("32 Jan 1971 00:00:00 GMT"), // day too big
-            _XPLATSTR("30 Feb 1971 00:00:00 GMT"), // day too big for feb
-            _XPLATSTR("30 Feb 1971 00:00:00 GMT"), // day too big for feb (non-leap year)
-            _XPLATSTR("32 Mar 1971 00:00:00 GMT"), // other months
-            _XPLATSTR("31 Apr 1971 00:00:00 GMT"),
-            _XPLATSTR("32 May 1971 00:00:00 GMT"),
-            _XPLATSTR("31 Jun 1971 00:00:00 GMT"),
-            _XPLATSTR("32 Jul 1971 00:00:00 GMT"),
-            _XPLATSTR("32 Aug 1971 00:00:00 GMT"),
-            _XPLATSTR("31 Sep 1971 00:00:00 GMT"),
-            _XPLATSTR("32 Oct 1971 00:00:00 GMT"),
-            _XPLATSTR("31 Nov 1971 00:00:00 GMT"),
-            _XPLATSTR("32 Dec 1971 00:00:00 GMT"),
-            _XPLATSTR("01 Jan 1971 70:00:00 GMT"), // hour too big
-            _XPLATSTR("01 Jan 1971 24:00:00 GMT"),
-            _XPLATSTR("01 Jan 1971 00:60:00 GMT"), // minute too big
-            _XPLATSTR("01 Jan 1971 00:00:70 GMT"), // second too big
-            _XPLATSTR("01 Jan 1971 00:00:61 GMT"),
-            _XPLATSTR("01 Jan 1969 00:00:00 GMT"), // underflow
-            _XPLATSTR("01 Jan 1969 00:00:00 CEST"), // bad tz
-            _XPLATSTR("01 Jan 1970 00:00:00 +2400"), // bad tzoffsets
-            _XPLATSTR("01 Jan 1970 00:00:00 -3000"),
-            _XPLATSTR("01 Jan 1970 00:00:00 +2160"),
-            _XPLATSTR("01 Jan 1970 00:00:00 -2400"),
-            _XPLATSTR("01 Jan 1970 00:00:00 -2160"),
-        };
-
-        for (const auto& str : bad_strings)
-        {
-            auto dt = utility::datetime::from_string(str, utility::datetime::RFC_1123);
-            VERIFY_ARE_EQUAL(0, dt.to_interval());
-        }
-    }
-
-    TEST(parsing_time_iso8601_boundary_cases)
-    {
-        // boundary cases:
-        TestDateTimeRoundtrip(_XPLATSTR("1970-01-01T00:00:00Z"));                                         // epoch
-        TestDateTimeRoundtrip(_XPLATSTR("2038-01-19T03:14:06+00:00"), _XPLATSTR("2038-01-19T03:14:06Z")); // INT_MAX - 1
-#ifndef _USE_32BIT_TIME_T
-        TestDateTimeRoundtrip(_XPLATSTR("2038-01-19T03:13:07-00:01"),
-                              _XPLATSTR("2038-01-19T03:14:07Z")); // INT_MAX after subtacting 1
-        TestDateTimeRoundtrip(_XPLATSTR("2038-01-19T03:14:07-00:00"), _XPLATSTR("2038-01-19T03:14:07Z"));
-#endif // _USE_32BIT_TIME_T
-    }
-
-    TEST(parsing_time_iso8601_uses_each_timezone_digit)
-    {
-        TestDateTimeRoundtrip(_XPLATSTR("2019-01-14T23:16:21+00:00"), _XPLATSTR("2019-01-14T23:16:21Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("2019-01-14T23:16:21-00:01"), _XPLATSTR("2019-01-14T23:17:21Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("2019-01-14T23:16:21+00:01"), _XPLATSTR("2019-01-14T23:15:21Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("2019-01-14T23:16:21-01:00"), _XPLATSTR("2019-01-15T00:16:21Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("2019-01-14T23:16:21+01:00"), _XPLATSTR("2019-01-14T22:16:21Z"));
-    }
-
-    TEST(parsing_time_iso8601_uses_each_digit)
-    {
-        TestDateTimeRoundtrip(_XPLATSTR("1970-01-01T00:00:01Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("1970-01-01T00:01:00Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("1970-01-01T01:00:00Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("1970-01-02T00:00:00Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("1970-02-01T00:00:00Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("1971-01-01T00:00:00Z"));
-
-        TestDateTimeRoundtrip(_XPLATSTR("1999-01-01T00:00:00Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("1970-12-01T00:00:00Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("1970-09-01T00:00:00Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("1970-01-30T00:00:00Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("1970-01-31T00:00:00Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("1970-01-01T23:00:00Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("1970-01-01T19:00:00Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("1970-01-01T00:59:00Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("1970-01-01T00:00:59Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("1970-01-01T00:00:60Z"), _XPLATSTR("1970-01-01T00:01:00Z")); // leap seconds
-    }
-
-    TEST(parsing_time_iso8601_accepts_month_max_days)
-    {
-        TestDateTimeRoundtrip(_XPLATSTR("1970-01-31T00:00:00Z")); // jan
-        TestDateTimeRoundtrip(_XPLATSTR("2019-02-28T00:00:00Z")); // non leap year allows feb 28
-        TestDateTimeRoundtrip(_XPLATSTR("2020-02-29T00:00:00Z")); // leap year allows feb 29
-        TestDateTimeRoundtrip(_XPLATSTR("1970-03-31T00:00:00Z")); // mar
-        TestDateTimeRoundtrip(_XPLATSTR("1970-04-30T00:00:00Z")); // apr
-        TestDateTimeRoundtrip(_XPLATSTR("1970-05-31T00:00:00Z")); // may
-        TestDateTimeRoundtrip(_XPLATSTR("1970-06-30T00:00:00Z")); // jun
-        TestDateTimeRoundtrip(_XPLATSTR("1970-07-31T00:00:00Z")); // jul
-        TestDateTimeRoundtrip(_XPLATSTR("1970-08-31T00:00:00Z")); // aug
-        TestDateTimeRoundtrip(_XPLATSTR("1970-09-30T00:00:00Z")); // sep
-        TestDateTimeRoundtrip(_XPLATSTR("1970-10-31T00:00:00Z")); // oct
-        TestDateTimeRoundtrip(_XPLATSTR("1970-11-30T00:00:00Z")); // nov
-        TestDateTimeRoundtrip(_XPLATSTR("1970-12-31T00:00:00Z")); // dec
-    }
-
-    TEST(parsing_time_iso8601_accepts_lowercase_t_z)
-    {
-        TestDateTimeRoundtrip(_XPLATSTR("1970-01-01t00:00:00Z"), _XPLATSTR("1970-01-01T00:00:00Z"));
-        TestDateTimeRoundtrip(_XPLATSTR("1970-01-01T00:00:00z"), _XPLATSTR("1970-01-01T00:00:00Z"));
-    }
-
-    TEST(parsing_time_roundtrip_datetime_accepts_invalid_no_trailing_timezone)
+    TEST(parsing_time_roundtrip_datetime_invalid1,
+         "Ignore:Linux",
+         "Codeplex issue #115",
+         "Ignore:Apple",
+         "Codeplex issue #115")
     {
         // No digits after the dot, or non-digits. This is not a valid input, but we should not choke on it,
         // Simply ignore the bad fraction
         const utility::string_t bad_strings[] = {_XPLATSTR("2013-11-19T14:30:59.Z"),
-                                                 _XPLATSTR("2013-11-19T14:30:59.a12Z")};
+                                                 _XPLATSTR("2013-11-19T14:30:59.1a2Z")};
         utility::string_t str_corrected = _XPLATSTR("2013-11-19T14:30:59Z");
 
         for (const auto& str : bad_strings)
@@ -387,87 +151,12 @@ SUITE(datetime)
 
     TEST(parsing_time_roundtrip_datetime_invalid2)
     {
-        // Various unsupported cases. In all cases, we have produce an empty date time
+        // Variouls unsupported cases. In all cases, we have produce an empty date time
         const utility::string_t bad_strings[] = {
-            _XPLATSTR(""),                     // empty
-            _XPLATSTR(".Z"),                   // too short
-            _XPLATSTR(".Zx"),                  // no trailing Z
-            _XPLATSTR("3.14Z")                 // not a valid date
-            _XPLATSTR("a971-01-01T00:00:00Z"), // any non digits or valid separators
-            _XPLATSTR("1a71-01-01T00:00:00Z"),
-            _XPLATSTR("19a1-01-01T00:00:00Z"),
-            _XPLATSTR("197a-01-01T00:00:00Z"),
-            _XPLATSTR("1971a01-01T00:00:00Z"),
-            _XPLATSTR("1971-a1-01T00:00:00Z"),
-            _XPLATSTR("1971-0a-01T00:00:00Z"),
-            _XPLATSTR("1971-01a01T00:00:00Z"),
-            _XPLATSTR("1971-01-a1T00:00:00Z"),
-            _XPLATSTR("1971-01-0aT00:00:00Z"),
-            // _XPLATSTR("1971-01-01a00:00:00Z"), parsed as complete date
-            _XPLATSTR("1971-01-01Ta0:00:00Z"),
-            _XPLATSTR("1971-01-01T0a:00:00Z"),
-            _XPLATSTR("1971-01-01T00a00:00Z"),
-            _XPLATSTR("1971-01-01T00:a0:00Z"),
-            _XPLATSTR("1971-01-01T00:0a:00Z"),
-            _XPLATSTR("1971-01-01T00:00a00Z"),
-            _XPLATSTR("1971-01-01T00:00:a0Z"),
-            _XPLATSTR("1971-01-01T00:00:0aZ"),
-            // "1971-01-01T00:00:00a", accepted as per invalid_no_trailing_timezone above
-            _XPLATSTR("1"), // truncation
-            _XPLATSTR("19"),
-            _XPLATSTR("197"),
-            _XPLATSTR("1970"),
-            _XPLATSTR("1970-"),
-            _XPLATSTR("1970-0"),
-            _XPLATSTR("1970-01"),
-            _XPLATSTR("1970-01-"),
-            _XPLATSTR("1970-01-0"),
-            // _XPLATSTR("1970-01-01"), complete date
-            _XPLATSTR("1970-01-01T"),
-            _XPLATSTR("1970-01-01T0"),
-            _XPLATSTR("1970-01-01T00"),
-            _XPLATSTR("1970-01-01T00:"),
-            _XPLATSTR("1970-01-01T00:0"),
-            _XPLATSTR("1970-01-01T00:00"),
-            _XPLATSTR("1970-01-01T00:00:"),
-            _XPLATSTR("1970-01-01T00:00:0"),
-            // _XPLATSTR("1970-01-01T00:00:00"), // accepted as invalid timezone above
-            _XPLATSTR("4970-01-01T00:00:00Z"), // year too big
-            _XPLATSTR("3001-01-01T00:00:00Z"),
-            _XPLATSTR("1971-00-01T00:00:00Z"), // month too small
-            _XPLATSTR("1971-20-01T00:00:00Z"), // month too big
-            _XPLATSTR("1971-13-01T00:00:00Z"),
-            _XPLATSTR("1971-01-00T00:00:00Z"), // day too small
-            _XPLATSTR("1971-01-32T00:00:00Z"), // day too big
-            _XPLATSTR("1971-02-30T00:00:00Z"), // day too big for feb
-            _XPLATSTR("1971-02-30T00:00:00Z"), // day too big for feb (non-leap year)
-            _XPLATSTR("1971-03-32T00:00:00Z"), // other months
-            _XPLATSTR("1971-04-31T00:00:00Z"),
-            _XPLATSTR("1971-05-32T00:00:00Z"),
-            _XPLATSTR("1971-06-31T00:00:00Z"),
-            _XPLATSTR("1971-07-32T00:00:00Z"),
-            _XPLATSTR("1971-08-32T00:00:00Z"),
-            _XPLATSTR("1971-09-31T00:00:00Z"),
-            _XPLATSTR("1971-10-32T00:00:00Z"),
-            _XPLATSTR("1971-11-31T00:00:00Z"),
-            _XPLATSTR("1971-12-32T00:00:00Z"),
-            _XPLATSTR("1971-01-01T70:00:00Z"), // hour too big
-            _XPLATSTR("1971-01-01T24:00:00Z"),
-            _XPLATSTR("1971-01-01T00:60:00Z"), // minute too big
-            _XPLATSTR("1971-01-01T00:00:70Z"), // second too big
-            _XPLATSTR("1971-01-01T00:00:61Z"),
-            _XPLATSTR("1969-01-01T00:00:00Z"), // underflow
-#ifdef _USE_32BIT_TIME_T
-            _XPLATSTR("3000-01-01T00:00:01Z"), // overflow
-#endif
-            _XPLATSTR("3001-01-01T00:00:00Z"),
-            _XPLATSTR("1970-01-01T00:00:00+00:01"), // time zone underflow
-            // _XPLATSTR("1970-01-01T00:00:00.Z"), // accepted as invalid timezone above
-            _XPLATSTR("1970-01-01T00:00:00+24:00"), // bad tzoffsets
-            _XPLATSTR("1970-01-01T00:00:00-30:00"),
-            _XPLATSTR("1970-01-01T00:00:00+21:60"),
-            _XPLATSTR("1970-01-01T00:00:00-24:00"),
-            _XPLATSTR("1970-01-01T00:00:00-21:60"),
+            _XPLATSTR(""),     // empty
+            _XPLATSTR(".Z"),   // too short
+            _XPLATSTR(".Zx"),  // no trailing Z
+            _XPLATSTR("3.14Z") // not a valid date
         };
 
         for (const auto& str : bad_strings)
@@ -477,6 +166,16 @@ SUITE(datetime)
         }
     }
 
+    TEST(parsing_time_roundtrip_time)
+    {
+        // time only without date
+        utility::string_t str = _XPLATSTR("14:30:59.1234567Z");
+        auto dt = utility::datetime::from_string(str, utility::datetime::ISO_8601);
+        utility::string_t str2 = dt.to_string(utility::datetime::ISO_8601);
+        // Must look for a substring now, since the date part is filled with today's date
+        VERIFY_IS_TRUE(str2.find(str) != std::string::npos);
+    }
+
 } // SUITE(datetime)
 
 } // namespace utils_tests