Serialize DateTime.MinValue as UTC 0000Z

Author: mythz

src/ServiceStack.Text/DateTimeExtensions.cs

@@ -24,6 +24,7 @@ public static class DateTimeExtensions
         public const long UnixEpoch = 621355968000000000L;
         private static readonly DateTime UnixEpochDateTimeUtc = new DateTime(UnixEpoch, DateTimeKind.Utc);
         private static readonly DateTime UnixEpochDateTimeUnspecified = new DateTime(UnixEpoch, DateTimeKind.Unspecified);
+        private static readonly DateTime MinDateTimeUtc = new DateTime(1, 1, 1, 0, 0, 0, DateTimeKind.Utc);
 
         public static long ToUnixTime(this DateTime dateTime)
         {
@@ -146,6 +147,8 @@ public static DateTime ToStableUniversalTime(this DateTime dateTime)
         {
             if (dateTime.Kind == DateTimeKind.Utc)
                 return dateTime;
+            if (dateTime == DateTime.MinValue)
+                return MinDateTimeUtc;
 
 #if SILVERLIGHT
 			// Silverlight 3, 4 and 5 all work ok with DateTime.ToUniversalTime, but have no TimeZoneInfo.ConverTimeToUtc implementation.

tests/ServiceStack.Text.Tests/Utils/DateTimeSerializerTests.cs

@@ -213,5 +213,14 @@ private void AssertDatesAreEqual(DateTime toDateTime, DateTime dateTime, string
         {
 			Assert.That(toDateTime.ToStableUniversalTime().RoundToMs(), Is.EqualTo(dateTime.ToStableUniversalTime().RoundToMs()), which);
         }
+
+        [Test]
+        public void Can_Serialize_new_DateTime()
+        {
+            var newDateTime = new DateTime();
+            var convertedUnixTimeMs = newDateTime.ToUnixTimeMs();
+            Assert.That(convertedUnixTimeMs.FromUnixTimeMs(), Is.EqualTo(newDateTime));
+        }
+
 	}
 }