[DUG] Daylight savings

[Jeremy Coulter]

I have some code at home I use that reads the TZ stuff from Windows and
then does its calculations etc.
I will fire it thru when I get home if you have no joy.

Jeremy


On Thu, Apr 3, 2014 at 1:39 PM, Rodney <rchan at compuspec.com> wrote:

> Probably can have a look at these links:
>
>
> http://stackoverflow.com/questions/3448983/delphi-equivalent-to-c-sharp-date
> time-isdaylightsavingtime-method-needed
>
> http://code.google.com/p/delphi-tzdb/
>
>
> Rodney
>
>
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> Today's Topics:
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>    1. Re: Daylight savings (Robo)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 3 Apr 2014 00:49:01 +0200
> From: Robo <robo555 at gmail.com>
> Subject: Re: [DUG] Daylight savings
> To: NZ Borland Developers Group - Delphi List
>         <delphi at listserver.123.net.nz>
> Message-ID:
>         <CAJLpVUM1Kd98B0xTyTRF-R8atWtqK2usPaypKX6xprkSh=
> Pqyg at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> NZ changed the day light saving week a few years ago, hence the incorrect
> calculation on older version of Delphi. Easiest way would probably be to
> copy XE5's source code.
>
> Robo
>
>
> On Thu, Apr 3, 2014 at 12:30 AM, Alister Christie <
> alister at salespartner.co.nz> wrote:
>
> > I've noticed in Delphi XE that TTimeZone.Local.ToUniversalTime is a
> > week out on daylight savings, it works correctly in XE5 however (and
> > probably earlier versions).
> >
> > program Project6;
> >
> > {$APPTYPE CONSOLE}
> >
> > uses
> >   SysUtils,
> >   DateUtils;
> >
> > begin
> >   Writeln(DateTimeToStr(TTimeZone.Local.ToUniversalTime(StrToDateTime(
> > '5/4/2014 2pm'))));
> >   Writeln(DateTimeToStr(TTimeZone.Local.ToUniversalTime(StrToDateTime(
> > '12/4/2014 2pm'))));
> >   Readln;
> > end.
> >
> >
> > Outputs
> >
> > 5/04/2014 1:00:00 a.m.
> > 6/04/2014 1:00:00 a.m.
> >
> > in XE (incorrectly) and
> >
> > 5/04/2014 1:00:00 a.m.
> > 6/04/2014 2:00:00 a.m.
> >
> > in XE5 (correctly).  XE works correctly from the 13th onwards - so
> > it's just a problem for a week.
> >
> > Does anyone have some code that does conversions to UTC correctly for
> > Delphi XE?
> >
> > Alister Christie
> > Computers for People
> > Ph: 04 471 1849 Fax: 04 471 1266http://www.salespartner.co.nz Follow
> > us on Twitter http://twitter.com/salespartner PO Box 13085
> > Johnsonville Wellington
> >
> >
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