C# SetTimeZoneInformation doesn't work?

[Cagnulein]

Hi everybody,
i'm trying to debug a problem on a SetTimeZoneInformation: in order to make the thing easier for me and for you I wrote a simple application written on C# .NET 2.0 that simply set the timezone.
I know that the bestway to set the timezone is to do it on the linux side, but i think it you should work in Wine too in order to have 100% compatibility of Windows software.

I attached here the source code and the executable.
You could try yourself: in the code i change the bias, but the time doesn't change.

This is the main part:

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            TimeZoneInformation timeZoneInformation = GetTimeZone();
            TimeZoneInformation a = timeZoneInformation;
            Console.WriteLine(a.bias);
            Console.WriteLine(DateTime.Now);
            a.bias = 120;
            a.standardName = "ciccio";
            SetTimeZone(a);
            timeZoneInformation = GetTimeZone();
            Console.WriteLine(a.bias);
            Console.WriteLine(DateTime.Now);

[DarkShadow44]

On Windows the output is

Code: Select all

-60
19.01.2020 23:08:55
120
19.01.2020 23:08:55

So, where's the problem?

[Cagnulein]

Sorry, put this line

Code: Select all

            SetTimeZone(a);
+           CultureInfo.CurrentCulture.ClearCachedData();
            timeZoneInformation = GetTimeZone();

On windows you will have

Code: Select all

-60
20/01/2020 08:42:03
120
20/01/2020 05:42:03

instead on wine you will have

Code: Select all

-60
20/01/2020 08:42:03
120
20/01/2020 08:42:03

I put the new exe here.

[DarkShadow44]

Still have the same times on windows...

[Cagnulein]

Still have the same times on windows...

On which windows' version are you trying it?
On Windows 10 this is the my result.

[DarkShadow44]

Using Win7. On Win10 it behaves like you said. Is this documented behavior?

[Cagnulein]

No, i've only saw an answer on StackOverflow about it

[DarkShadow44]

Well, if it's reliable, wine could implement it. Where did you find that problem originally? In some program or something you made yourself?

[Cagnulein]

On a software that I wrote on my own.
Wine could use the source code that I've already attached as reference

[DarkShadow44]

Or you could work around the issue to have it consistent across windows.

[Cagnulein]

i've alread worked around it, but i thought it could be useful for wine too to follow the behavior of windows

[DarkShadow44]

Makes sense. Probably best to report it to https://bugs.winehq.org/