Edit report at https://bugs.php.net/bug.php?id=65201&edit=1
ID: 65201
Comment by: mail+php at requinix dot net
Reported by: easysurf at easysurf dot cc
Summary: Africa/Cairo time off by 1 hour
Status: Open
Type: Feature/Change Request
Package: Date/time related
Operating System: Window 8
PHP Version: 5.5.0
Block user comment: N
Private report: N
New Comment:
Windows/PHP 5.3.26 CLI:
ab's code:
- putenv() not respected, outputs default (local) time with timezone warnings
(getenv() says Cairo, $_ENV says nothing)
- manually setting it with "set TZ=Africa/Cairo" on the command line before
executing works
(getenv() and $_ENV say Cairo)
- date_default_timezone_set() instead works
easysurf's code:
- outputs default (local) time with timezone warnings
Ubuntu/PHP 5.3.10:
ab's code:
- putenv() works
- date_default_timezone_set() works
easysurf's code:
- outputs local+2h with timezone warnings
The code does have a bug as ab saw:
1. Grabs the current time as a string according to the current timezone
2. Interprets the string according to the GMT timezone and gets a timestamp
3. Uses the timestamp to output the time in Cairo
Net effect is adding 2 hours (Cairo minus GMT) to the current time.
Fix: don't do anything at all with GMT and use date_default_timezone_set()
instead
of putenv(TZ). Like literally
<?php
date_default_timezone_set($city2);
echo date("l g:i A")."\n";
?>
All that aside, 5.3 is now EOL and 5.4+ doesn't use TZ.
Previous Comments:
------------------------------------------------------------------------
[2013-07-07 08:17:23] a...@php.net
Typing 'time in cairo' into google will show you the same. Anyway, lets see if
someone else can reproduce the behavior you describe.
------------------------------------------------------------------------
[2013-07-06 21:27:02] easysurf at easysurf dot cc
<?php
putenv('TZ=Africa/Cairo');
echo date('l g:i A');
?>
The problem is that your site that sends out the time zone for Africa/Cairo is
off by an hour.
When I tried the above code it is still one hour off.
Goto:
http://wwp.greenwichmeantime.com/time-zone/africa/egypt/cairo/
You will see that there is a discrepancy between your time and theirs.
Also when I watch CNN with a live feed from Cairo with a timestamp, it does not
match you time but does match the time that Greenwich sends out.
------------------------------------------------------------------------
[2013-07-06 09:17:19] a...@php.net
I'm not sure what you're trying to do in that script, but i suppose it's a bug
in
it. You convert from local to GMT and then again. I cannot repro neither with
your
script nor with a much smaller sample
putenv('TZ=Africa/Cairo');
echo date('l g:i A');
Do that two lines work for you?
------------------------------------------------------------------------
[2013-07-06 02:08:21] easysurf at easysurf dot cc
<?php
function recity($anycity) {
$lcity1 = strlen($anycity);
$pos1 = strpos($anycity, "/");
$pos1 = $pos1 + 1;
$sstrt1 = $lcity1 - $pos1;
$tncity = substr($anycity, $pos1, $sstrt1);
$tncity2 = "";
for ($i = 0, $j = strlen($tncity); $i <= $j; $i++) {
if (substr($tncity, $i, 1) == "_") {
$tncity2 = $tncity2 . " ";
}
else {
$tncity2 = $tncity2 . substr($tncity, $i, 1);
}
}
return $tncity2;
}
$time1 = date("g:i A", mktime());
$city1 = "GMT";
$city2 = "Africa/Cairo";
$ncity1 = recity($city1);
$ncity2 = recity($city2);
$start_time_input = $time1;
$start_tz = $city1;
$end_tz = $city2;
putenv("TZ=$start_tz");
$start_time = strtotime($start_time_input);
echo "<p><strong>";
echo "<BR /><br />";
echo "<BLOCKQUOTE><FONT SIZE=6>";
putenv("TZ=$end_tz");
echo date("l g:i A",$start_time)."\n";
echo "</strong>";
echo " in $ncity2.</p>";
echo "</FONT></BLOCKQUOTE>";
echo "<BR /><br />";
echo "<P>return to <A HREF=http://www.easysurf.cc/tmnw4.htm>What Time is it
now?</A><P>";
?>
------------------------------------------------------------------------
[2013-07-05 07:14:03] a...@php.net
Please post a small PHP code snippet and date related INI directives.
------------------------------------------------------------------------
The remainder of the comments for this report are too long. To view
the rest of the comments, please view the bug report online at
https://bugs.php.net/bug.php?id=65201
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