[Lazarus] Possible error with Now function over summer/winter time change?
david-taylor at blueyonder.co.uk
Mon Oct 28 08:49:13 CET 2013
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
> 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.
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?
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