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Bug #39968 date() is extremely slow
Submitted: 2006-12-27 22:32 UTC Modified: 2006-12-27 22:35 UTC
From: katzenmayer at erfnet dot de Assigned:
Status: Not a bug Package: Performance problem
PHP Version: 5.2.0 OS: Debian Sarge
Private report: No CVE-ID: None
 [2006-12-27 22:32 UTC] katzenmayer at erfnet dot de
While switching a calendar script from PHP4 to PHP5 I noticed the script takes multiple times as long to complete in PHP5 than it did in PHP4.

The problem seems to be date() and mktime() functions.

I did not notice any other PHP5 related performance issues. Scripts that do not use date() or mktime() run very fast.

Reproduce code:

  for ($i=0;$i<100000;$i++)

Now check this script with both PHP4 and PHP5:

time php4 test.php
time php5 test.php

Expected result:
The script should take about the same time in both PHP4 and PHP5

Actual result:
time php4 test.php

real    0m0.286s
user    0m0.034s
sys     0m0.252s

time php5 test.php

real    0m25.252s
user    0m18.579s
sys     0m5.615s


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 [2006-12-27 22:35 UTC]
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at and the instructions on how to report
a bug at

You need to set the timezone, otherwise a notice is raised 
which is what's killing the speed of your code.
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