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Bug #17965 Strftime returns day of the week 1 to high after 23-6-2002
Submitted: 2002-06-25 05:57 UTC Modified: 2002-06-27 21:14 UTC
From: didier dot peereboomvoller at o2 dot com Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 4.1.2 OS: Linux 2.4.??
Private report: No CVE-ID: None
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From: didier dot peereboomvoller at o2 dot com
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 [2002-06-25 05:57 UTC] didier dot peereboomvoller at o2 dot com 
I use strftime("%y" , $var) to get the day of the week to display in a website. http://nieuws.online.o2.nl (dutch site, designed for a pda)

However since 23-6-2002 (D/M/Y) it displays the day of the week as being one higher then it really is. 23 was a sunday. wich should make 24 monday. However it returns 2 both in %u and %w wich make it tuesday. I tried it on three different servers. one of them running 4.0.4pl1 and they all have the same problem.
http://julia.o2.nl/problem.php (4.0.4)
http://romeo.online.o2.nl/problem.php (4.1.2)

Following is the code. I think I did everything right, according to the "it worked before" principle.


0 = zondag<br>
1 = maandag<br>
2 = dinsdag<br>
3 = woensdag<br>
4 = donderdag<br>
5 = vrijdag<br>
6 = zaterdag<br>
7 = zondag<br>
<?php
print(strftime("%u" , time()) . "<br>\n");
if(!ereg("([0-9]*)-([0-9]*)-([0-9]*) ([0-9]*):([0-9]*):([0-9]*)" , "2002-06-25 11:09:12" , $b))
  Exit_Error("Invalid date format found");
                                // int mktime ( int hour, int minute, int second, int month, int day, int year [, int is_dst])
$timestamp = mktime($b[3] , $b[5] , $b[6] , $b[2] , $b[3] , $b[1]);
print("dag    " . $b[3] . "<br>\n");
print("maand  " . $b[2] . "<br>\n");
print("jaar   " . $b[1] . "<br>\n");
print("uur    " . $b[4] . "<br>\n");
print("min    " . $b[5] . "<br>\n");
print("sec    " . $b[6] . "<br>\n");
print($timestamp . "<br>\n");
print(strftime("DAG 1 = maandag [%u] DAG 0 = zondag [%w]" , $timestamp) . "<br>\n");
print("------------------------<br>\n");
if(!ereg("([0-9]*)-([0-9]*)-([0-9]*) ([0-9]*):([0-9]*):([0-9]*)" , "2002-06-23 11:09:12" , $b))
  Exit_Error("Invalid date format found");
                                // int mktime ( int hour, int minute, int second, int month, int day, int year [, int is_dst])
$timestamp = mktime($b[3] , $b[5] , $b[6] , $b[2] , $b[3] , $b[1]);
print("dag    " . $b[3] . "<br>\n");
print("maand  " . $b[2] . "<br>\n");
print("jaar   " . $b[1] . "<br>\n");
print("uur    " . $b[4] . "<br>\n");
print("min    " . $b[5] . "<br>\n");
print("sec    " . $b[6] . "<br>\n");
print($timestamp . "<br>\n");
print(strftime("DAG 1 = maandag [%u] DAG 0 = zondag [%w]" , $timestamp) . "<br>\n");
  print("------------------------<br>\n");
if(!ereg("([0-9]*)-([0-9]*)-([0-9]*) ([0-9]*):([0-9]*):([0-9]*)" , "2002-06-24 11:09:12" , $b))
  Exit_Error("Invalid date format found");
                                // int mktime ( int hour, int minute, int second, int month, int day, int year [, int is_dst])
$timestamp = mktime($b[3] , $b[5] , $b[6] , $b[2] , $b[3] , $b[1]);
print("dag    " . $b[3] . "<br>\n");
print("maand  " . $b[2] . "<br>\n");
print("jaar   " . $b[1] . "<br>\n");
print("uur    " . $b[4] . "<br>\n");
print("min    " . $b[5] . "<br>\n");
print("sec    " . $b[6] . "<br>\n");
print($timestamp . "<br>\n");
print(strftime("DAG 1 = maandag [%u] DAG 0 = zondag [%w]" , $timestamp) . "<br>\n");
?>
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 [2002-06-26 09:42 UTC] didier dot peereboomvoller at o2 dot com 
It maybe that the error lies in mktime instead.
 [2002-06-26 15:06 UTC] sniper@php.net 
Please provide a _short_ example script without anything
that isn't relevant. (ie. such script that can be run in command line too)

Also, try this snapshot first:

http://snaps.php.net/php4-latest.tar.gz
 [2002-06-27 03:51 UTC] didier dot peereboomvoller at o2 dot com 
// As short as I can get it.
// turn sql type date into timestamp
ereg("([0-9]*)-([0-9]*)-([0-9]*) ([0-9]*):([0-9]*):([0-9]*)" , "2002-06-25 11:09:12" , $b)
$timestamp = mktime($b[3] , $b[5] , $b[6] , $b[2] , $b[3] , $b[1]);
print(strftime("DAG 1 = maandag [%u] DAG 0 = zondag [%w]" , $timestamp) . "\n");
 [2002-06-27 04:01 UTC] rasmus@php.net 
Well, one obvious problem here is that you are passing in 09 as one of the arguments to mktime.  09 is not a valid number.  Any number that starts with 0 is treated as an octal which obviously doesn't have a 9 in it.  This may not be the problem  since it would only affect the minute-arg of the example you provided.
 [2002-06-27 21:14 UTC] sniper@php.net 
$timestamp = mktime($b[3] , $b[5] , $b[6] , $b[2] , $b[3] , $b[1]);

This should be:

$timestamp = mktime($b[4] , $b[5] , $b[6] , $b[2] , $b[3] , $b[1]);

The first parameter to mktime should be HOUR...so of course it started misbehaving after 23rd..

Not a bug. (and you should also consider what Rasmus noticed, 09 != 9)
 
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