diff --git a/http/ut/utility_test.cpp b/http/ut/utility_test.cpp
index c774996..a1125b4 100644
--- a/http/ut/utility_test.cpp
+++ b/http/ut/utility_test.cpp
@@ -85,7 +85,7 @@
 {
     // some time before the epoch
     EXPECT_EQ(getDateTimeStdtime(std::time_t{-1234567}),
-              "1969-12-17T17:03:53+00:00");
+              "1970-01-01T00:00:00+00:00");
 
     // epoch
     EXPECT_EQ(getDateTimeStdtime(std::time_t{0}), "1970-01-01T00:00:00+00:00");
@@ -120,7 +120,7 @@
 {
     // returns the maximum Redfish date
     EXPECT_EQ(getDateTimeUintMs(std::numeric_limits<uint64_t>::max()),
-              "9999-12-31T23:59:59.999000+00:00");
+              "9999-12-31T23:59:59+00:00");
     EXPECT_EQ(getDateTimeUintMs(std::numeric_limits<uint64_t>::min()),
               "1970-01-01T00:00:00+00:00");
 }