diff --git a/src/JT809.Protocol/Formatters/JT809HeaderFormatter.cs b/src/JT809.Protocol/Formatters/JT809HeaderFormatter.cs
index 3ebb0eb..b18233e 100644
--- a/src/JT809.Protocol/Formatters/JT809HeaderFormatter.cs
+++ b/src/JT809.Protocol/Formatters/JT809HeaderFormatter.cs
@@ -23,18 +23,20 @@ namespace JT809.Protocol.Formatters
             jT809Header.Version = new JT809Header_Version(reader.ReadArray(JT809Header_Version.FixedByteLength));
             jT809Header.EncryptFlag = (JT809Header_Encrypt)reader.ReadByte();
             jT809Header.EncryptKey = reader.ReadUInt32();
+            jT809Header.Time = reader.ReadUTCDateTime();
             return jT809Header;
         }
 
         public void Serialize(ref JT809MessagePackWriter writer, JT809Header value, IJT809Config config)
         {
             writer.WriteUInt32(value.MsgLength);
-            writer.WriteUInt32( value.MsgSN);
+            writer.WriteUInt32(value.MsgSN);
             writer.WriteUInt16(value.BusinessType);
             writer.WriteUInt32(value.MsgGNSSCENTERID);
             writer.WriteArray(value.Version.Buffer);
             writer.WriteByte((byte)value.EncryptFlag);
             writer.WriteUInt32(value.EncryptKey);
+            writer.WriteUTCDateTime(value.Time);
         }
     }
 }
diff --git a/src/JT809.Protocol/JT809Header.cs b/src/JT809.Protocol/JT809Header.cs
index 2553cb2..944e594 100644
--- a/src/JT809.Protocol/JT809Header.cs
+++ b/src/JT809.Protocol/JT809Header.cs
@@ -49,5 +49,9 @@ namespace JT809.Protocol
         /// 数据加密的密匙，长度为 4 个字节
         /// </summary>
         public uint EncryptKey { get; set; }
+        /// <summary>
+        /// 发送消息时的系统UTC时间，长度为8个字节
+        /// </summary>
+        public DateTime Time { get; set; } = DateTime.Now;
     }
 }