DateTime and DST | Microsoft Connect

DateTime and DST by vkornienko

Closed

as External Help for as External

Type:	Bug
ID:	767046
Opened:	10/11/2012 6:12:11 AM
Access Restriction:	Public

Workaround(s)

view

User(s) can reproduce this bug

Guys you have problem with DST in Moscow.
It was UTC+3/UTC+4 before 2011.
It became UTC+4/UTC+4 in 2011 till now.

But DateTime (aftter applying KB2756822 update) thinks that before 2012 it was UTC+4/UTC+5!!! It's absolutely wrong! Please fix it or suggest a workaround.

Details (expand)

.NET Framework 4.0

Change Your timezone to Moscow and run code:
Console.WriteLine(new DateTime(2005, 01, 01).ToString("yyyy-MM-dd HH:mm:ss.ffffzzz"));
Console.WriteLine(new DateTime(2005, 06, 01).ToString("yyyy-MM-dd HH:mm:ss.ffffzzz"));
Console.WriteLine(new DateTime(2010, 01, 01).ToString("yyyy-MM-dd HH:mm:ss.ffffzzz"));
Console.WriteLine(new DateTime(2010, 06, 01).ToString("yyyy-MM-dd HH:mm:ss.ffffzzz"));
Console.WriteLine(new DateTime(2011, 01, 01).ToString("yyyy-MM-dd HH:mm:ss.ffffzzz"));
Console.WriteLine(new DateTime(2011, 06, 01).ToString("yyyy-MM-dd HH:mm:ss.ffffzzz"));
Console.WriteLine(new DateTime(2012, 01, 01).ToString("yyyy-MM-dd HH:mm:ss.ffffzzz"));
Console.WriteLine(new DateTime(2012, 06, 01).ToString("yyyy-MM-dd HH:mm:ss.ffffzzz"));
Console.WriteLine(new DateTime(2013, 01, 01).ToString("yyyy-MM-dd HH:mm:ss.ffffzzz"));
Console.WriteLine(new DateTime(2013, 06, 01).ToString("yyyy-MM-dd HH:mm:ss.ffffzzz"));

English

Windows 7 SP1

English

2005-01-01 00:00:00.0000+04:00
2005-06-01 00:00:00.0000+05:00
2010-01-01 00:00:00.0000+04:00
2010-06-01 00:00:00.0000+05:00
2011-01-01 00:00:00.0000+04:00
2011-06-01 00:00:00.0000+05:00
2012-01-01 00:00:00.0000+04:00
2012-06-01 00:00:00.0000+04:00
2013-01-01 00:00:00.0000+04:00
2013-06-01 00:00:00.0000+04:00

2005-01-01 00:00:00.0000+03:00
2005-06-01 00:00:00.0000+04:00
2010-01-01 00:00:00.0000+03:00
2010-06-01 00:00:00.0000+04:00
2011-01-01 00:00:00.0000+04:00
2011-06-01 00:00:00.0000+04:00
2012-01-01 00:00:00.0000+04:00
2012-06-01 00:00:00.0000+04:00
2013-01-01 00:00:00.0000+04:00
2013-06-01 00:00:00.0000+04:00

0 attachments

Hello,

Thanks for bringing up this interesting issue. We are always grateful when customers point towards potential concerns - this helps us ensuring the quality of the .NET Framework and driving the product into the right direction.

Indeed, you have discovered a genuine problem, however it is not related to the .Net Framework. In this case our classes consume time zone information from the Windows OS. This information is updated through patches as you already have discovered. If you need to, patches can be uninstalled through the control panel. But keep in mind this will also affect other time zones. Here are the details of all the information contained in the patch that seems to affect you http://support.microsoft.com/kb/2756822

If you need more help with this specific issue, please refer it to the appropriate channel through http://support.microsoft.com/

I thank you for your time and your contribution.

Alfredo
(Software Engineer on the .NET Base Class Libraries team)