diff --git a/NewLife.Core/Data/Snowflake.cs b/NewLife.Core/Data/Snowflake.cs
index 11d272303..877a46e32 100644
--- a/NewLife.Core/Data/Snowflake.cs
+++ b/NewLife.Core/Data/Snowflake.cs
@@ -348,6 +348,9 @@ public virtual Boolean TryParse(Int64 id, out DateTime time, out Int32 workerId,
     /// <returns></returns>
     public DateTime ConvertKind(DateTime time)
     {
+        // 如果待转换时间未指定时区，则直接返回
+        if (time.Kind == DateTimeKind.Unspecified) return time;
+
         return StartTimestamp.Kind switch
         {
             DateTimeKind.Utc => time.ToUniversalTime(),