Brad Fuller wrote:
-----Original Message-----
From: Brad Fuller [mailto:bfuller@xxxxxxxxxxxxxxxx]
Sent: Thursday, February 15, 2007 3:48 PM
To: 'Terra Frost'; 'Peter Lauri'
Cc: php-general@xxxxxxxxxxxxx
Subject: RE: plugging gmmktime value into gmdate yields incorrect
date
-----Original Message-----
From: Terra Frost [mailto:terrafrost@xxxxxxxxx]
Sent: Thursday, February 15, 2007 3:20 PM
To: Peter Lauri
Cc: php-general@xxxxxxxxxxxxx
Subject: Re: plugging gmmktime value into gmdate yields incorrect
date
date('Z') on the server producing the incorrect output returns 3600. On
the other two, I get -18000 and -21600.
That said, I don't see how that'd make a difference. The whole reason
I'm using the gm* functions, in the first place, is because those are
supposed to work with a fixed timezone - GMT. Testament to this is the
fact that gmdate('Z') returns 0 on all three of those.
Peter Lauri wrote:
And what are the time zones for those two different machines? And what
is
the time? :)
Best regards,
Peter Lauri
www.dwsasia.com - company web site
www.lauri.se - personal web site
www.carbonfree.org.uk - become Carbon Free
-----Original Message-----
From: Terra Frost [mailto:terrafrost@xxxxxxxxx]
Sent: Thursday, February 15, 2007 8:47 PM
To: php-general@xxxxxxxxxxxxx
Subject: plugging gmmktime value into gmdate yields incorrect
date
I tried running the following script on three different servers:
<?php
echo gmdate('m, d, Y', gmmktime(0,0,0,3,23,2000) );
?>
On two of the servers, I got 03, 23, 2000 back. On the other,
however, I got 03, 22, 2000. This doesn't make any sense to me.
On the servers that return the correct date (03, 23, 2000),
gmmktime(0,0,0,3,23,2000) returns 953769600. On the server that
returns the incorrect date (03, 22, 2000), gmmktime(0,0,0,3,23,2000)
returns 953766000. There's a difference of 3600 between the two,
which makes me think that some daylight savings time setting is to
blame.
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I may be way off... but isn't it redundant to use both gmdate() and
gmmktime()? I thought each of these functions were used to convert your
local time into GMT...
So for example if you're GMT+5, the gmmktime() would subtract 5 hours, and
then gmdate() would subtract another 5 hours?
Like I said - I could be way off, but just a thought.
-Brad
Yes, I was a little off...
gmmktime() takes a GMT date and converts it to a local unix timestamp.
gmdate() takes a local unix timestamp and converts it to a GMT date.
So in theory you *should* get the same date you put in, if using both
functions like your example.
I think you are on the right track with the Daylight Saving time issue.
Starting this year, DST in the U.S. begins in March instead of April.
Given that the year of your date input is 2000, it shouldn't be affected,
but perhaps that is in fact the culprit? Your date 3/23 falls in between the
previous and future DST start dates.
Hmm...
Have you gotten similar results using a different month/day?
-Brad
if you run:
echo gmdate('I', gmmktime(0,0,0,3,23,2000) ); //Capital 'i'
I (capital i) - "1" if Daylight Savings Time, "0" otherwise.
This might help you
--
Enjoy,
Jim Lucas
Different eyes see different things. Different hearts beat on different
strings. But there are times for you and me when all such things agree.
- Rush
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