DateTime.Now Off By An Hour On Coworker's Computer

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c#
datetime

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+1 Q:

DateTime.Now Off By An Hour On Coworker's Computer

Hi, I have a program that posts Datetime.Now(), but my coworkers computer's DateTime.Now() is off by an hour.

He changed it in his windows Date and Time Properties, but he is still posting a DateTime.Now() that is an hour off.

How can I fix this on his box without making modifications to my program (I have too many projects going on and need a quick fix for now)

+8 A:

Is he in the correct time zone? Better use DateTimeOffset.

Flo 2010-09-15 14:45:06

I will check. Would this make a difference?

Soo 2010-09-15 14:45:33

Yes. It's quite likely something like daylight savings time, if not the time zone as such.

Steven Sudit 2010-09-15 14:45:54

Does DateTime.Now change only when you restart the program? I think this is what was causing the problem.

Soo 2010-09-15 14:55:20

No, it changes each time you call it (unless you call so frequently that not enough time has passed to make any difference to its value).

Steven Sudit 2010-09-15 14:58:44

@Steven, then I'm completely stumped. My coworker's timezone and daylight savings settings were all fine, and his time is fine too. This is really bugging me out! :S

Soo 2010-09-15 15:19:19

@Soo: So the time shown in the bottom right corner of his screen is correct, and the time zone and DST are correct, but `DateTime.Now` differs from yours?

Steven Sudit 2010-09-15 15:50:49

@Steven: Yes, I saw it with my own eyes on his computer, I'm stumped.

Soo 2010-09-15 17:24:03

@Soo: Obvious follow-up question, given Hans' response: Does his `DateTime.UtcNow` differ?

Steven Sudit 2010-09-15 18:12:37

+2 A:

Ask him to enable daylight savings time observance and to verify the timezone. And in general use DateTime.UtcNow. Ask more questions about it at superuser.com

Hans Passant 2010-09-15 14:46:16

Yes, I will implement UtcNow with the next release of my program :)

Soo 2010-09-15 14:47:51

Using UTC is a very good idea, particularly in a distributed system. It does mean that, in some cases, you will need to convert to the user's time zone for presentation purposes, but that's worth the trouble.

Steven Sudit 2010-09-15 14:59:51

Definitely, the conversion is pretty simple too. The posting time is having a negative effect on how the program works, so I agree, it definitely will be worth the trouble.

Soo 2010-09-15 15:20:18

ansaurus

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DateTime.Now Off By An Hour On Coworker's Computer

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