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List:       php-internals
Subject:    Re: [PHP-DEV] [PATCH] new idate() - sunrise() - sunset() functions
From:       Brian Foddy <brian.foddy () nwa ! com>
Date:       2003-02-06 22:49:39
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I would be very interested.  And not just for PHP, tho I
would like to see a PHP function for it.
We have several apps that are currently obtaining the GMT offset
the old-fashion way.

1.  Set the TZ=GMT, perform a mktime call.
2.  Set TZ to local timezone, perform the same mktime call.
3.  Subtract the 2 timestamps.
4.  Reset TZ back to its standard value.

If you properly set the dst param, the result will be the
time difference between the two timezones for whatever
date/time you want.

As ugly as this seems (and I do agree its ugly), it actually
works very well, stable, and performs pretty fast.  Our apps
perform this sequence tens of thousands times per day at least.
I always felt if I "had the time" I'd try and re-write it
to do something along the same you describe, but never got
there.

Brian


David Gillies wrote:

>In a similar itch-scratching moment I whipped up a
>trivial PHP module that groks tzfile timezone files to
>give you the offset from GMT at any time in the Unix
>epoch. I needed this to preflight a bunch of data
>which had been gathered with a lot of disparate time
>zones into a single UTC version, but I thought it
>might merit further dissemination.
>
>Anyone interested?
>
>Best Wishes
>
>David Gillies
>San Jose
>Costa Rica
>
>  
>
>>sunrise() - sunset() functions
>>
>>    
>>
>
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