DST and timezone

[geotdw]

Hi,

I'm currently using Qt 4.8 to program. I was wondering how can I change my TimeZone to a specific city or country so that I would be able to check if the DST is active for that city and if so what the value is for that DST. In other words, let's say I program using Pacific time, and my application has to create something with a validation date. Now the user has a choice of selecting the timezone he wants to create the validation date for from a list of cities (for example he chooses London which is GMT +00:00). How can I know if London had the DST active or not at that moment, and if it is how much is the DST for like +1 +2 and so on...

Regards

[davidovv]

when there are time-zones involved i always use QDateTime::toUTC(), UTC doesn't use DST, you can compare original datetime with datetime.toUTC() to see the real difference in hours