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Setting Daylight Savings Flag

I have some code to set the time & timezone on my machine. To do this I use the SetLocalTime and SetTimezoneInformation methods. What I can't seem to do is find a way to set the daylight savings flag on or off. Can someone please let me know how to do this? I'm guessing its just a matter of setting the correct information in the SYSTEMTIME struct I use when calling SetTimezoneInformation?

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Nick75

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jpick

ASKER

Thanks Nick75, I've seen that in the documentation(msdn). The trouble is how do you know the 3 letter code for all the timezones, not just the ones in the US? So if I live in Europe somewhere, how would I turn on/off daylight savings?

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jpick

ASKER

Although this is not the answer I was looking for, I will give nick the points.

Nick75

Have you played with the Bias member of TIME_ZONE_INFORMATION?

I'd assume "Coordinated Universal Time (UTC)" to mean GMT. You may then choose to have an enumerated type or map<string,LONG> for various timezones around the world. If you double click the clock on the Windows toolbar that'll get you started with a few offsets. I won't guarantee that this is a full list - I'm sure I remember the timezone being off by 15 minutes somewhere - though I could be wrong - I'm sure they would have complained to MS... (but then, hasn't everybody :-) )