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C# 時間戳轉換

System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc));
// Javascript時間戳
long timeStamp = (long)(DateTime.Now - startTime).TotalMilliseconds;
DateTime dt = startTime.AddMilliseconds(timeStamp);
// Unix時間戳
long timeStamp = (long)(DateTime.Now - startTime).Seconds;
DateTime dt 
= startTime.AddSeconds(timeStamp);