diff --git a/http/ut/utility_test.cpp b/http/ut/utility_test.cpp
index a1125b4..8bc122f 100644
--- a/http/ut/utility_test.cpp
+++ b/http/ut/utility_test.cpp
@@ -118,11 +118,24 @@
 
 TEST(Utility, GetDateTimeUintMs)
 {
+    EXPECT_EQ(getDateTimeUintMs(uint64_t{1638312095123}),
+              "2021-11-30T22:41:35.123+00:00");
     // returns the maximum Redfish date
     EXPECT_EQ(getDateTimeUintMs(std::numeric_limits<uint64_t>::max()),
-              "9999-12-31T23:59:59+00:00");
+              "9999-12-31T23:59:59.999+00:00");
     EXPECT_EQ(getDateTimeUintMs(std::numeric_limits<uint64_t>::min()),
-              "1970-01-01T00:00:00+00:00");
+              "1970-01-01T00:00:00.000+00:00");
+}
+
+TEST(Utility, GetDateTimeUintUs)
+{
+    EXPECT_EQ(getDateTimeUintUs(uint64_t{1638312095123456}),
+              "2021-11-30T22:41:35.123456+00:00");
+    // returns the maximum Redfish date
+    EXPECT_EQ(getDateTimeUintUs(std::numeric_limits<uint64_t>::max()),
+              "9999-12-31T23:59:59.999999+00:00");
+    EXPECT_EQ(getDateTimeUintUs(std::numeric_limits<uint64_t>::min()),
+              "1970-01-01T00:00:00.000000+00:00");
 }
 
 TEST(Utility, UrlFromPieces)