C# 本地時間轉換爲utc時間並顯示

Console.WriteLine(TimeZoneInfo.ConvertTimeToUtc(DateTime.Now).ToString("yyyy-MM-ddTHH:mm:ss.fffZ"));

輸出 2022-09-28T08:17:12.455Z

附錄：https://learn.microsoft.com/en-us/dotnet/standard/datetime/converting-between-time-zones

https://stackoverflow.com/questions/3323113/datetime-to-string-with-time-zone