diff --git a/src/ServiceStack.Text/DateTimeExtensions.cs b/src/ServiceStack.Text/DateTimeExtensions.cs
index 0373037f3..4c79c3792 100644
--- a/src/ServiceStack.Text/DateTimeExtensions.cs
+++ b/src/ServiceStack.Text/DateTimeExtensions.cs
@@ -45,6 +45,12 @@ public static long ToUnixTimeMsAlt(this DateTime dateTime)
         {
             return (dateTime.ToStableUniversalTime().Ticks - UnixEpoch) / TimeSpan.TicksPerMillisecond;
         }
+        
+        public static long ToUnixTimeMs(this DateTimeOffset dateTimeOffset)
+        {
+            var universal = ToDateTimeSinceUnixEpoch(dateTimeOffset);
+            return (long)universal.TotalMilliseconds;
+        }
 
         public static long ToUnixTimeMs(this DateTime dateTime)
         {
@@ -56,6 +62,9 @@ public static long ToUnixTime(this DateTime dateTime)
         {
             return (dateTime.ToDateTimeSinceUnixEpoch().Ticks) / TimeSpan.TicksPerSecond;
         }
+        
+        private static TimeSpan ToDateTimeSinceUnixEpoch(this DateTimeOffset dateTimeOffset)
+            => ToDateTimeSinceUnixEpoch(dateTimeOffset.UtcDateTime);
 
         private static TimeSpan ToDateTimeSinceUnixEpoch(this DateTime dateTime)
         {