diff --git a/src/Mixpanel/Mixpanel.Tests/MixpanelTestsBase.cs b/src/Mixpanel/Mixpanel.Tests/MixpanelTestsBase.cs
index defa0e4..8973325 100644
--- a/src/Mixpanel/Mixpanel.Tests/MixpanelTestsBase.cs
+++ b/src/Mixpanel/Mixpanel.Tests/MixpanelTestsBase.cs
@@ -15,7 +15,7 @@ public abstract class MixpanelTestsBase
         protected static readonly DateTime Time = new DateTime(2013, 11, 30, 0, 0, 0, DateTimeKind.Utc);
         protected static readonly DateTimeOffset TimeOffset = new DateTimeOffset(2013, 11, 30, 0, 0, 0, TimeSpan.Zero);
         protected const long TimeUnix = 1385769600L;
-        protected const string TimeFormat = "2013-11-30T00:00:00";
+        protected const string TimeFormat = "2013-11-30T00:00:00.000";
         protected const double DurationSeconds = 2.34D;
         protected static readonly TimeSpan Duration = TimeSpan.FromSeconds(DurationSeconds);
         protected const string Os = "Windows";
@@ -28,7 +28,7 @@ public abstract class MixpanelTestsBase
         protected const string LastName = "Vader";
         protected const string Name = "Darth Vader";
         protected static readonly DateTime Created = new DateTime(2014, 10, 22, 0, 0, 0, DateTimeKind.Utc);
-        protected const string CreatedFormat = "2014-10-22T00:00:00";
+        protected const string CreatedFormat = "2014-10-22T00:00:00.000";
         protected const string Email = "darth.vader@mail.com";
         protected const string Phone = "589741";
         protected const string Alias = "999";
diff --git a/src/Mixpanel/Mixpanel/Parsers/TimeParser.cs b/src/Mixpanel/Mixpanel/Parsers/TimeParser.cs
index 1074146..e161ee6 100644
--- a/src/Mixpanel/Mixpanel/Parsers/TimeParser.cs
+++ b/src/Mixpanel/Mixpanel/Parsers/TimeParser.cs
@@ -6,7 +6,7 @@ namespace Mixpanel.Parsers
     internal static class TimeParser
     {
         private const long UnixEpoch = 621355968000000000L;
-        private const string MixpanelDateFormat = "yyyy-MM-ddTHH:mm:ss";
+        private const string MixpanelDateFormat = "yyyy-MM-ddTHH:mm:ss.fff";
 
         public static ValueParseResult ParseUnix(object rawDateTime)
         {
@@ -65,7 +65,7 @@ public static ValueParseResult ParseMixpanelFormat(object rawDateTime)
 
                 default:
                     return ValueParseResult.CreateFail(
-                        "Expected types are: DateTime, DateTimeOffset or correctly formatted Mixpanel date string (yyyy-MM-ddTHH:mm:ss).");
+                        "Expected types are: DateTime, DateTimeOffset or correctly formatted Mixpanel date string (yyyy-MM-ddTHH:mm:ss.fff).");
             }
         }
     }