How to programmatically change system time zone

Question

I'm working on changing system time zone from within WPF application. To do this i'm using unmanaged code that i've found on this site:changing time zones. It does change my time zone. However when I click on windows' clock i see a message: "Your current time zone is not recognized. Please select a valid time zone using the link below." I could imagine there is a slight difference somewhere. I've analyzed one time zone - how it's represented before programmatic change and after.

BEFORE:

BaseUtcOffset: 4:00:00:00
Daylight Name: "Arabian Daylight Time"
Display Name: "(UTC +4:00) Abu Dhabi, Muscat"
Id: "Arabian Daylight Time"
Standard Name: "Arabian Daylight Time"
SupportsDaylightSavingTime: false

AFTER:

BaseUtcOffset: -4:00:00:00
Daylight Name: ""
Display Name: "Arabian Daylight Time"
Id: "Arabian Daylight Time"
Standard Name: "Arabian Daylight Time"
SupportsDaylightSavingTime: false

I found no way to set "Display Name" using TIME_ZONE_INFORMATION. So something that it's called "(UTC +4:00) Abu Dhabi, Muscat" on GUI when changed by user manually using Windows setting, now it's called "Arabian Daylight Time". Perhaps those differences are one of the reasons why i see "Your current time zone..." message. I've read somewhere else that restart helps and this message disappears - unfortunately after restart nothing changes.

Answer 1

Well. I've found my mistake. The problem was that on Windows 7 i was trying to change time zone with:

[DllImport("kernel32.dll", CharSet = CharSet.Auto)]   
private static extern bool SetTimeZoneInformation([In] ref TimeZoneInformation lpTimeZoneInformation);

while i should have used:

[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
private static extern bool SetDynamicTimeZoneInformation([In] ref DynamicTimeZoneInformation lpTimeZoneInformation);

Using DYNAMIC_TIME_ZONE_INFORMATION solved most of the problems regarding my current task.