Edit report at https://bugs.php.net/bug.php?id=61599&edit=1
ID: 61599
Comment by: paul at paul-robinson dot us
Reported by: grom358_spamkill at yahoo dot com dot au
Summary: Wrong Day of Week
Status: Open
Type: Bug
Package: Date/time related
Operating System: Linux
PHP Version: 5.3.10
Block user comment: N
Private report: N
New Comment:
I can confirm this bug, which I originally thought was in Wikimedia.
<?php
$h = mktime(0, 0, 0, 1, 1, 1600);
$d = date("F dS, Y", $h) ;
$w= date("l", $h) ;
Echo "$d is on a $w<br>";
$h = mktime(0, 0, 0, 1, 1, 1599);
$d = date("F dS, Y", $h) ;
$w= date("l", $h) ;
Echo "$d is on a $w<br>";
?>
Returns:
January 01st, 1600 is on a Saturday
January 01st, 1599 is on a Saturday
January 1, 1599 was a Friday.
I did a few other tests for Wikimedia, you can see how they show up there.
http://en.wikipedia.org/w/index.php?title=Template:X8&oldid=557212409
Another version:
<?php
$h = mktime(0, 0, 0, 5, 28, 2013);
$d = date("F dS, Y", $h) ;
$w= date("l", $h) ;
Echo "$d is on a $w, ";
$h = mktime(0, 0, 0, 1, 1, 2013);
$d = date("F dS, Y", $h) ;
$w= date("l", $h) ;
Echo "$d is on a $w, ";
$h = mktime(0, 0, 0, 1, 1, 1901);
$d = date("F dS, Y", $h) ;
$w= date("l", $h) ;
Echo "$d is on a $w, ";
$h = mktime(0, 0, 0, 1, 1, 1900);
$d = date("F dS, Y", $h) ;
$w= date("l", $h) ;
Echo "$d is on a $w, ";
$h = mktime(0, 0, 0, 1, 1, 1601);
$d = date("F dS, Y", $h) ;
$w= date("l", $h) ;
Echo "$d is on a $w, ";
$h = mktime(0, 0, 0, 1, 1, 1600);
$d = date("F dS, Y", $h) ;
$w= date("l", $h) ;
Echo "$d is on a $w<br>";
$h = mktime(0, 0, 0, 1, 1, 1599);
$d = date("F dS, Y", $h) ;
$w= date("l", $h) ;
Echo "$d is on a $w, ";
$h = mktime(0, 0, 0, 1, 1, 1598);
$d = date("F dS, Y", $h) ;
$w= date("l", $h) ;
Echo "$d is on a $w<br>";
?>
Results:
May 28th, 2013 is on a Tuesday, January 01st, 2013 is on a Tuesday, January
01st, 1901 is on a Tuesday, January 01st, 1900 is on a Monday, January 01st,
1601 is on a Monday, January 01st, 1600 is on a Saturday
January 01st, 1599 is on a Saturday, January 01st, 1598 is on a Friday
Today, 2013, 1901, 1900, 1601 and 1600 are correct.
1599 and 1598 are incorrect. 1599 was a Friday, 1598 was a Thursday.
Previous Comments:
------------------------------------------------------------------------
[2012-05-13 22:29:02] grom358_spamkill at yahoo dot com dot au
Just to make it clearer, run the following:
<?php
$date = new DateTime();
$date->setDate(1599, 12, 31);
echo $date->format('l, jS F Y') . PHP_EOL;
$date->setDate(1600, 1, 1);
echo $date->format('l, jS F Y') . PHP_EOL;
You will see there is two saturdays in a row :O
------------------------------------------------------------------------
[2012-05-12 23:57:26] grom358_spamkill at yahoo dot com dot au
@zhanglijiu it should return Friday so your results confirm this bug
------------------------------------------------------------------------
[2012-05-11 15:54:22] zhanglijiu at gmail dot com
According to your code,my results is "Saturday, 15th October 1582 Saturday,
31st
December 1599", there is nothing wrong.
My system is Mac 10.6.8 PHP 5.3.1
------------------------------------------------------------------------
[2012-04-02 06:08:04] grom358_spamkill at yahoo dot com dot au
Description:
------------
The 15th October 1582 is a Friday (see
http://en.wikipedia.org/wiki/Gregorian_calendar). Testing with Python and Java
confirms this as well. Also checked the Gnome calendar.
The Proleptic Gregorian Calendar (see
http://en.wikipedia.org/wiki/Proleptic_Gregorian_calendar) just extends the
Gregorian calendar backwards. I'm assuming PHP is using proleptic calendar,
which
would make 4th october 1582 a monday. But again DateTime gets it wrong.
I made a script to find the breaking point, and it occurs at 31st December
1599.
It returns it as a Saturday when in fact its a Friday.
Test script:
---------------
<?php
$date = new DateTime();
$date->setDate(1582, 10, 15);
echo $date->format('l, jS F Y') . PHP_EOL;
$date->setDate(1599, 12, 31);
echo $date->format('l, jS F Y') . PHP_EOL;
Expected result:
----------------
Friday, 15th October 1582
Friday, 31st December 1599
Actual result:
--------------
Saturday, 15th October 1582
Saturday, 31st December 1599
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=61599&edit=1
