diff --git a/Admin.NET/Admin.NET.Core/SignatureAuth/SignatureAuthenticationHandler.cs b/Admin.NET/Admin.NET.Core/SignatureAuth/SignatureAuthenticationHandler.cs
index e6beeae6..753c2f82 100644
--- a/Admin.NET/Admin.NET.Core/SignatureAuth/SignatureAuthenticationHandler.cs
+++ b/Admin.NET/Admin.NET.Core/SignatureAuth/SignatureAuthenticationHandler.cs
@@ -67,7 +67,7 @@ public sealed class SignatureAuthenticationHandler : AuthenticationHandler<Signa
         if (!long.TryParse(timestampStr, out var timestamp))
             return await AuthenticateResultFailAsync("timestamp 值不合法");
 
-        var requestDate = DateTimeUtil.ToLocalTimeDateBySeconds(timestamp);
+        var requestDate = DateTimeUtil.ConvertUnixTime(timestamp);
 
 #if NET6_0
         var utcNow = Clock.UtcNow;
diff --git a/Admin.NET/Admin.NET.Core/Util/DateTimeUtil.cs b/Admin.NET/Admin.NET.Core/Util/DateTimeUtil.cs
index 070f2abb..7e76b274 100644
--- a/Admin.NET/Admin.NET.Core/Util/DateTimeUtil.cs
+++ b/Admin.NET/Admin.NET.Core/Util/DateTimeUtil.cs
@@ -8,6 +8,26 @@ namespace Admin.NET.Core;
 
 public class DateTimeUtil
 {
+    /// <summary>
+    /// 根据unix时间戳的长度自动判断是秒还是以毫秒为单位
+    /// </summary>
+    /// <param name="unixTime"></param>
+    /// <returns></returns>
+    public static DateTime ConvertUnixTime(long unixTime)
+    {
+        // 判断时间戳长度
+        bool isMilliseconds = unixTime > 9999999999;
+
+        if (isMilliseconds)
+        {
+            return DateTimeOffset.FromUnixTimeMilliseconds(unixTime).ToLocalTime().DateTime;
+        }
+        else
+        {
+            return DateTimeOffset.FromUnixTimeSeconds(unixTime).ToLocalTime().DateTime;
+        }
+    }
+
     /// <summary>
     /// 获取开始时间
     /// </summary>