On Thursday 03 of November 2011 21:30:19 Sven Barth wrote: > Am 02.11.2011 19:25, schrieb Ludo Brands: > > Apparently not everything is that transparent under windows: > > http://msdn.microsoft.com/en-us/library/windows/desktop/ms724944%28v=vs.8 > > 5%2 9.aspx > > > > "To inform Explorer that the time zone has changed, send the > > WM_SETTINGCHANGE message." > > WM_SETTINGCHANGE simply notifies you that the user changed the time > zone, because otherwise you might not be able to detect that (except you > read the settings from the registry yourself). > > > Or: > > > > http://channel9.msdn.com/coding4fun/articles/Changing-time-zones > > > > "By itself, changing the time zone doesn't have any apparent effect > > except in new processes. In order to see the change, you need to send a > > system notification message. This notification is made by calling > > SendMessageTimeout with WM_SettingChange and a parameter of "intl". " > > This is wrong. Changing the timezone effects e.g. all following calls to > GetLocalTime. See the following example program: > > === source begin === > > program timezonetest; > > {$apptype console} > {$mode objfpc}{$H+} > > uses > SysUtils; > > begin > Writeln(FormatDateTime('c', Now)); > Writeln('Please change the timezone and then press enter'); > Readln; > Writeln(FormatDateTime('c', Now)); > Writeln('Done'); > Readln; > end. > > === source end === > > As you see there is no message processing. > > My normal timezone is Berlin. Now I've run the program and changed the > timezone to Greenland (-3h). The output was the following: > > === output begin === > > 03.11.2011 21:16:33 > Please change the timezone and then press enter > > 03.11.2011 17:17:10 > Done > > === output end === > > So your link which talks about "only affects new processes" is proven > wrong.
But this is on windows ? On linux it does not work without re-reading tzdata. zeljko
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