Thread View: borland.public.cppbuilder.nativeapi
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6 total messages
Started by Michael Thomsen
Thu, 07 Aug 2008 09:42
Timezone problems
Author: Michael Thomsen
Date: Thu, 07 Aug 2008 09:42
Date: Thu, 07 Aug 2008 09:42
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Hello, I would like to convert the current PC time into UTC. According to my documentation the function GetTimeZoneInformation() should do what I need, but either it doesn't work, or I do not understand how it works: TTimeZoneInformation TimeZone; GetTimeZoneInformation(&TimeZone); TransmitPCtime(Now()+(double)(TimeZone.Bias+TimeZone.DaylightBias)/(60*24)); The above code works for most timezones, both with standard and daylight saving time. However for certain timezones and standard/daylight saving combinations (for instance Adelane, Australia) the result is not correct. Can anybody tell me what I'm doing wrong? //michael -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/
Re: Timezone problems
Author: Alan Bellingham
Date: Thu, 07 Aug 2008 10:03
Date: Thu, 07 Aug 2008 10:03
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"Michael Thomsen" <sorry@no.spam> wrote: >Can anybody tell me what I'm doing wrong? Is there any reason why you're not using GetSystemTime(), which is documented as follows: "The GetSystemTime function retrieves the current system date and time. The system time is expressed in Coordinated Universal Time (UTC)." (Otherwise, do check the PC's clock is actually set correctly.) Alan Bellingham -- Team Browns ACCU Conference 2009: to be announced
Re: Timezone problems
Author: Alan Bellingham
Date: Thu, 07 Aug 2008 10:06
Date: Thu, 07 Aug 2008 10:06
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Alan Bellingham <alan@lspace.org> wrote: >Is there any reason why you're not using GetSystemTime(), which is >documented as follows: I should point out that I was actually spelunking in this area recently, trying to do the opposite - to get the local time and its offset for display in a history file. I *was* using GetSystemTime(), when I shouldn't have been. (I was also in VC++, so Now() wasn't to hand.) Alan Bellingham -- Team Browns ACCU Conference 2009: Wed 22 - Sat 25 April 2009, Oxford
Re: Timezone problems
Author: Michael Thomsen
Date: Thu, 07 Aug 2008 10:11
Date: Thu, 07 Aug 2008 10:11
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On Thu, 07 Aug 2008 12:03:08 +0200, Alan Bellingham <alan@lspace.org> wrote: >> Can anybody tell me what I'm doing wrong? > > Is there any reason why you're not using GetSystemTime(), which is > documented as follows: > > "The GetSystemTime function retrieves the current system date and time. > The system time is expressed in Coordinated Universal Time (UTC)." That can only be because I didn't happen to stumple upon it. I'll take a look at it and see if it works better than my other "solution". Thanks for your input! //michael -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/
Re: Timezone problems
Author: Alan Bellingham
Date: Thu, 07 Aug 2008 10:32
Date: Thu, 07 Aug 2008 10:32
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"Michael Thomsen" <sorry@no.spam> wrote: >That can only be because I didn't happen to stumple upon it. Ah, pretty much what I suspected. The first person to invent a sensible context-sensitive help system for the Windows APIs will be an absolute hero. Alan Bellingham -- Team Browns ACCU Conference 2009: Wed 22 - Sat 25 April 2009, Oxford
Re: Timezone problems
Author: Remy Lebeau (TeamB)
Date: Thu, 07 Aug 2008 16:31
Date: Thu, 07 Aug 2008 16:31
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"Michael Thomsen" <sorry@no.spam> wrote in message news:op.ufifwanvhrxo93@mtpc... > I would like to convert the current PC time into UTC. According to > my documentation the function GetTimeZoneInformation() should do > what I need, but either it doesn't work, or I do not understand how it > works: You are not taking all of the TTimeZoneInformation values into account. The DaylightBias value is only valid if GetTimeZoneInformation() returns TIME_ZONE_ID_DAYLIGHT and the TTimeZoneInformation.DaylightDate.wMonth value is not zero. Gambit
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