asp.net - how to convert server time to local time

Question

I have a problem with time
My server is in the USA and I'm in Denmark (Europa) and I would like to have my site show the time in my local time. How can I do that?

I try this

Datetime localtime = DateTimeOffset.Now.ToOffset(new TimeSpan(1,0,0)).DateTime;

and it works, but it will only work when I'm in GMT+1 / UTC+1 and not when I'm in GMT+2 / UTC+2. Is there another way of doing this - a simpler way of doing it?

Answer 1

The only way you should do it is as follows:

string zoneId = "Central European Standard Time";
TimeZoneInfo tzi = TimeZoneInfo.FindSystemTimeZoneById(zoneId);
DateTime result = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow,tzi);
Console.WriteLine("Time is " + result + " in Denmark");

Using the TimeZoneInfo class is the only reliable way in .Net to convert to/from different timezones AND get proper DST conversions.

TimeZoneInfo.ConvertTimeToUtc(dtLocal,tzi) is the reverse converting from a local time to a utc time.

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For the TimeZone Id strings, you can run the bit of code here...

foreach( var tz in TimeZoneInfo.GetSystemTimeZones() )
{
    Console.WriteLine(tz.DisplayName + " is Id=','" + tz.Id + "'");
}