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Bug #35039 strftime weird math
Submitted: 2005-10-31 19:41 UTC Modified: 2005-10-31 19:51 UTC
From: arcivanov at mail dot ru Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 5.0.5 OS: Slackware 10.1 (kern v2.6.14)
Private report: No CVE-ID: None
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 [2005-10-31 19:41 UTC] arcivanov at mail dot ru 
Description:
------------
strftime always displays Jan of year X as Jan of year X-1 when using '%B, %G' format for some years

Reproduce code:
---------------
function print_time($curr_time)
{
    echo ("Time according to date:\t\t" . date("Y-m-d H:i:s", $curr_time) . "\n");
    echo ("Time according to strftime:\t" . strftime('%B, %G', $curr_time) . "\n");
}

$curr_time = strtotime("2006-01-01 00:00:01");print_time ($curr_time);
$curr_time = strtotime("2005-01-01 00:00:01");print_time ($curr_time);
$curr_time = strtotime("2004-01-01 00:00:01");print_time ($curr_time);
$curr_time = strtotime("2003-01-01 00:00:01");print_time ($curr_time);
$curr_time = strtotime("2002-01-01 00:00:01");print_time ($curr_time);
$curr_time = strtotime("2001-01-01 00:00:01");print_time ($curr_time);
$curr_time = strtotime("2000-01-01 00:00:01");print_time ($curr_time);
$curr_time = strtotime("1999-01-01 00:00:01");print_time ($curr_time);


Expected result:
----------------
Time according to date:         2006-01-01 00:00:01
Time according to strftime:     January, 2006
Time according to date:         2005-01-01 00:00:01
Time according to strftime:     January, 2005
Time according to date:         2004-01-01 00:00:01
Time according to strftime:     January, 2004
Time according to date:         2003-01-01 00:00:01
Time according to strftime:     January, 2003
Time according to date:         2002-01-01 00:00:01
Time according to strftime:     January, 2002
Time according to date:         2001-01-01 00:00:01
Time according to strftime:     January, 2001
Time according to date:         2000-01-01 00:00:01
Time according to strftime:     January, 2000
Time according to date:         1999-01-01 00:00:01
Time according to strftime:     January, 1999


Actual result:
--------------
Time according to date:         2006-01-01 00:00:01
Time according to strftime:     January, 2005
Time according to date:         2005-01-01 00:00:01
Time according to strftime:     January, 2004
Time according to date:         2004-01-01 00:00:01
Time according to strftime:     January, 2004
Time according to date:         2003-01-01 00:00:01
Time according to strftime:     January, 2003
Time according to date:         2002-01-01 00:00:01
Time according to strftime:     January, 2002
Time according to date:         2001-01-01 00:00:01
Time according to strftime:     January, 2001
Time according to date:         2000-01-01 00:00:01
Time according to strftime:     January, 1999
Time according to date:         1999-01-01 00:00:01
Time according to strftime:     January, 1998

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 [2005-10-31 19:51 UTC] derick@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

Please read the documentation, %G is the ISO year, and if you use it together with the ISO week modifier (%V) then you'll see that jan 01 falls in the last week of the previous year.
 
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