[DUG] Daylight savings

[Rodney]

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:

   1. Re: Daylight savings (Robo)


----------------------------------------------------------------------

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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