From a11d6ce02f312b23ee26d7c74e716fa8a26ba66d Mon Sep 17 00:00:00 2001
From: yedajiang44 <602830483@qq.com>
Date: Wed, 22 Sep 2021 16:30:44 +0800
Subject: [PATCH] =?UTF-8?q?UTC=E6=97=B6=E9=97=B4=E8=AF=BB=E5=86=99?=
 =?UTF-8?q?=E7=AE=80=E5=8C=96?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../MessagePack/JT809MessagePackReader.cs           |  9 +--------
 .../MessagePack/JT809MessagePackWriter.cs           | 13 +------------
 2 files changed, 2 insertions(+), 20 deletions(-)

diff --git a/src/JT809.Protocol/MessagePack/JT809MessagePackReader.cs b/src/JT809.Protocol/MessagePack/JT809MessagePackReader.cs
index f65ec22..c49f0cf 100644
--- a/src/JT809.Protocol/MessagePack/JT809MessagePackReader.cs
+++ b/src/JT809.Protocol/MessagePack/JT809MessagePackReader.cs
@@ -391,14 +391,7 @@ namespace JT809.Protocol.MessagePack
             DateTime d;
             try
             {
-                ulong result = 0;
-                var readOnlySpan = GetReadOnlySpan(8);
-                for (int i = 0; i < 8; i++)
-                {
-                    ulong currentData = (ulong)readOnlySpan[i] << (8 * (8 - i - 1));
-                    result += currentData;
-                }
-                d = JT809Constants.UTCBaseTime.AddSeconds(result).AddHours(8);
+                d = JT809Constants.UTCBaseTime.AddSeconds(ReadUInt64()).AddHours(8);
             }
             catch (Exception)
             {
diff --git a/src/JT809.Protocol/MessagePack/JT809MessagePackWriter.cs b/src/JT809.Protocol/MessagePack/JT809MessagePackWriter.cs
index c5bbe36..4f7089f 100644
--- a/src/JT809.Protocol/MessagePack/JT809MessagePackWriter.cs
+++ b/src/JT809.Protocol/MessagePack/JT809MessagePackWriter.cs
@@ -229,18 +229,7 @@ namespace JT809.Protocol.MessagePack
             span[4] = (byte)(value.Millisecond);
             writer.Advance(5);
         }
-        public void WriteUTCDateTime(DateTime value)
-        {
-            ulong totalSecends = (ulong)(value.AddHours(-8) - JT809Constants.UTCBaseTime).TotalSeconds;
-            var span = writer.Free;
-            //高位在前
-            for (int i = 7; i >= 0; i--)
-            {
-                span[i] = (byte)(totalSecends & 0xFF);  //取低8位
-                totalSecends >>= 8;
-            }
-            writer.Advance(8);
-        }
+        public void WriteUTCDateTime(DateTime value)=>WriteUInt64((ulong)(value.AddHours(-8) - JT809Constants.UTCBaseTime).TotalSeconds);
         /// <summary>
         /// YYYYMMDD
         /// </summary>