Greenwich Mean Time - London.

[killinghall]

Was just thinking about how the world clocks on the XDA II synchronizes itself...

All GMT +/- on the list pivot around London/Dublin...but how is London and Dublin derived and (dynamically) updated since daylight saving times fluctuate from time to time?

[Rudegar]

i believe that the regional settings in windows take care of adding or subtracting the daylight saving

[killinghall]

i believe that the regional settings in windows take care of adding or subtracting the daylight saving

but how does it know when to add or subtract? sorry, i live in asia so mabbe i'm not savvy about how DST works...

[Shadamehr]

I know this from an OLD OLD program on my first ever Psion Series 3, many a moon ago, that however intricate it is, there IS a formula, pre-ordained, to calculate when DST starts and ends, for any given year.

Whether its as simple as a pre-set list of dates, or most likely, based on days that months start on etc, I cannot say.

And as to the method behind the formula, again I cannot say.

But I can say that an old old piece of software, on my Psion, was designed to work out just exactly this for you.

So somewhere, or somehow, this IS something than can either be calculated in advance, or is simply a pre-set list.

[pipo]

The DST is starting the last Sunday of March and is terminating the last Sunday of October. As simple as that.

From London