Fixing date parsing for VSTS repos

Author: StanleyGoldman

src/GitHub.Api/Helpers/Constants.cs

@@ -13,10 +13,12 @@ static class Constants
         public const string GitTimeoutKey = "GitTimeout";
         public const string Iso8601Format = @"yyyy-MM-dd\THH\:mm\:ss.fffzzz";
         public const string Iso8601FormatZ = @"yyyy-MM-dd\THH\:mm\:ss\Z";
+        public const string Iso8601FormatPointZ = @"yyyy-MM-dd\THH\:mm\:ss.ff\Z";
         public static readonly string[] Iso8601Formats = {
             Iso8601FormatZ,
             @"yyyy-MM-dd\THH\:mm\:ss.fffffffzzz",
             Iso8601Format,
+            Iso8601FormatPointZ,
             @"yyyy-MM-dd\THH\:mm\:sszzz",
         };
         public const DateTimeStyles DateTimeStyle = DateTimeStyles.AssumeUniversal | DateTimeStyles.AdjustToUniversal;

src/tests/UnitTests/Primitives/SerializationTests.cs

@@ -37,6 +37,25 @@ public void DateTimeSerializationRoundTrip()
             Assert.AreEqual(dt3, dt4);
         }
 
+        [Test]
+        public void DateTimeSerializationRoundTripFormatPointZ()
+        {
+            var dt1 = DateTimeOffset.ParseExact("2018-05-01T15:04:29.00Z", new []{ Constants.Iso8601FormatPointZ }, CultureInfo.InvariantCulture, Constants.DateTimeStyle);
+            DateTimeOffset.ParseExact("2018-05-01T15:04:29.00Z", Constants.Iso8601Formats, CultureInfo.InvariantCulture, Constants.DateTimeStyle);
+            var str1 = dt1.ToJson();
+            var ret1 = str1.FromJson<DateTimeOffset>();
+            Assert.AreEqual(dt1, ret1);
+        }
+
+        [Test]
+        public void DateTimeSerializationRoundTripFormatZ()
+        {
+            var dt1 = DateTimeOffset.ParseExact("2018-05-01T15:04:29Z", Constants.Iso8601Formats, CultureInfo.InvariantCulture, Constants.DateTimeStyle);
+            var str1 = dt1.ToJson();
+            var ret1 = str1.FromJson<DateTimeOffset>();
+            Assert.AreEqual(dt1, ret1);
+        }
+
         class TestData
         {
             public List<string> Things { get; set; } = new List<string>();