Jim Lucas wrote:
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
I got 0 on all three servers (even the one that's giving the incorrect
dates).
According to php.net, though, daylight savings time settings shouldn't
make a difference:
is_dst:
Parameters always represent a GMT date so is_dst doesn't influence
the result.
I tried to play around with that setting, all the same.
On the server that was reporting a date that was a day off (which is
running PHP 4.1.2 on Sun Solaris), gmmktime(0,0,0,3,23,2000,1) gave the
correct answer. gmmktime(0,0,0,3,23,2000,0) gave the incorrect answer.
On one of the servers that gave the correct answer (running PHP 4.4.3 on
some distro of Linux), gmmktime(0,0,0,3,23,2000,0) gave the correct
answer and gmmktime(0,0,0,3,23,2000,1) gave the incorrect answer.
On the last server (running PHP 4.4.4 on Windows), the last parameter
doesn't make a difference. It returns the correct answer regardless.
Making them all run on the same version of PHP would be nice, but two of
the three are on shared hosts which I have no real influence over.
Besides, I'd prefer to have this yield the same results on all three of
those servers - to be as cross-server compliant as possible.
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