有没有办法在 C# .net 中将时区格式（美国/芝加哥）转换为 UTC（-0500）？

Question

I'm being provided a set of timezone names and need to use them as UTC offsets. Is there a way to make this conversion to get the current UTC offset (including appropriate DST shift)?

Answer 1

This is what the TimeZoneInfo.GetUtcOffset method is designed to accomplish.

DateTime utcNow = DateTime.UtcNow;
TimeZoneInfo tz = TimeZoneInfo.FindSystemTimeZoneById("America/Chicago");
TimeSpan offset = tz.GetUtcOffset(utcNow);

The above will work if you are running .NET on Linux or Mac OSX, and in the future (starting with .NET 6) will work on Windows.

If you are running .NET on Windows today, you can use my TimeZoneConverter library which will internally convert the IANA time zone ID to a Windows time zone ID when getting a TimeZoneInfo object.

DateTime utcNow = DateTime.UtcNow;
TimeZoneInfo tz = TZConvert.GetTimeZoneInfo("America/Chicago");
TimeSpan offset = tz.GetUtcOffset(utcNow);