Convert DateTimeOffset to DateTime and add offset to this DateTime

Question

I have DateTimeOffset:

DateTimeOffset myDTO = DateTimeOffset.ParseExact(
                      "2015/01/15 17:37:00 -0500", "yyyy/MM/dd HH:mm:ss zzz", 
                      CultureInfo.InvariantCulture); 
Console.WriteLine(myDTO);

Result => "1/15/2015 17:37:00 -05:00"

How convert to DateTime and add this offset "-0500" in the resulted DateTime

Desired result => "1/15/2015 22:37:00"

That would be odd. Something like `1/15/2015 17:37:00 -05:00` normally means "The local time is 17:37, but that's 5 hours behind UTC" - in other words, a result of `1/15/2015 22:37:00` would be useful, as that's the UTC time - but 12:37 would be applying the offset *twice*. Can you explain more about your context? — Jon Skeet, Jan 15 '15 at 08:15
@JonSkeet oops,I do wrong, I want to be "1/15/2015 22:37:00" — Alex, Jan 15 '15 at 08:20
you can use , DateTimeOffset.DateTime property, ref: https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset.datetime?view=net-5.0. — SaddamBinSyed, Feb 03 '21 at 06:05

score 150 · Accepted Answer · answered Jan 15 '15 at 08:22

150

Use DateTimeOffset.UtcDateTime:

DateTime utc = myDTO.UtcDateTime; // 01/15/2015 22:37:00

answered Jan 15 '15 at 08:22

Tim Schmelter

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939

1

Darn, you were fast :), nevertheless to me this is the way to go. – RvdV79 Jan 15 '15 at 08:32

score 11 · Answer 2 · answered Jan 15 '15 at 08:31

You do not have to add the offset to the time when using UTC time. According to your example, you are referring to the UTC time. So this would mean that you can use DateTimeOffset.UtcDateTime like I demonstrated here:

DateTimeOffset myDTO = DateTimeOffset.ParseExact(
          "2015/01/15 17:37:00 -0500", "yyyy/MM/dd HH:mm:ss zzz",
          CultureInfo.InvariantCulture);
Console.WriteLine(myDTO);  //Will print 1/15/2015 17:37:00 -5:00

//Expected result would need to be 1/15/2015 22:37:00 (Which is UTC time)
DateTime utc = myDTO.UtcDateTime;  //Yields another DateTime without the offset.
Console.WriteLine(utc); //Will print 1/15/2015 22:37:00 like asked

score 0 · Answer 3 · answered Mar 09 '23 at 14:30

0

There is new Property in DateTimeOffset in new version of .net, use it:

DateTimeOffset.LocalDateTime

answered Mar 09 '23 at 14:30

PurTahan

789
8
24

It will not yield the result unlike that of the OP. – Soner from The Ottoman Empire Apr 19 '23 at 07:24

Convert DateTimeOffset to DateTime and add offset to this DateTime

3 Answers3

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