[Lazarus] Possible error with Now function over summer/winter time change?

Sven Barth pascaldragon at googlemail.com
Thu Nov 7 16:10:19 CET 2013

Am 28.10.2013 10:50, schrieb Sven Barth:
> Am 28.10.2013 08:49, schrieb David Taylor:
>> On 27/10/2013 16:40, Michael Van Canneyt wrote:
>> []
>>> It is a known problem.
>>> Doing this 100% correctly involves re-reading the timezone file at 
>>> every
>>> call of Now() or Date().
>>> Clearly, this is a huge performance impact, severely skewing the time
>>> information.
>>> So this is not done.
>>> The "unix" unit contains
>>> Procedure ReReadLocalTime;
>>> which will re-initialize the necessary variables. You can call this
>>> routine at regular intervals as you see fit.
>>> In your case, you may want to insert a call to this after every clock
>>> update, which would be once a second.
>>> Michael.
>> Thanks, Michael, that's most helpful, I can call it once an hour 
>> which will be more than enough.
>> However, it seems that in the version I have for the Raspberry Pi 
>> (Laz: 1.0.6 FPC: 2.6.0) the "Unix" unit does not contain this 
>> procedure.  I did find the source code for it, but I don't want to 
>> have to ask folk who might want to compile the clock program to have 
>> to also copy many lines of code from the Unix unit. (Oh, and I tried 
>> both "unix" and "Unix" - both seemed to work.)
>> Am I missing something?
> It's only in trunk for now.
It has been merged to 2.6.3 and thus will be part of 2.6.4.


More information about the Lazarus mailing list