#41844 [Opn->Asn]: Format returns incorrect number of digits for negative years -0001 to -0999
ID: 41844
Updated by: derick@php.net
Reported By: mattsch at gmail dot com
-Status: Open
+Status: Assigned
Bug Type: Date/time related
Operating System: Gentoo Linux 2007.0
PHP Version: 5.2.3
-Assigned To:
+Assigned To: derick
Previous Comments:
------------------------------------------------------------------------
[2007-06-28 17:32:37] mattsch at gmail dot com
I didn't mean to link the colon:
http://en.wikipedia.org/wiki/Year_zero
------------------------------------------------------------------------
[2007-06-28 17:30:18] mattsch at gmail dot com
Description:
------------
Format returns incorrect number of digits for negative years -0001 to
-0999. See ISO 8601:2004 and http://en.wikipedia.org/wiki/Year_zero:
The "basic" format for year 0 is the four-digit form 0000, which equals
the historical year 1 BC. Several "expanded" formats are possible: -0000
and +0000, as well as five- and six-digit versions. Earlier years are
also negative four-, five- or six-digit years, which have an absolute
value one less than the equivalent BC year, hence -0001 = 2 BC.
Reproduce code:
---------------
<?
$date = new DateTime('2007-06-28');
$date->modify('-3006 years');
echo $date->format(DATE_ISO8601);
?>
Outputs:
-999-06-17T00:00:00-0600
Expected:
-0999-06-17T00:00:00-0600
<?
$date = new DateTime('2007-06-28');
$date->modify('-2008 years');
echo $date->format(DATE_ISO8601);
?>
Outputs:
-001-06-17T00:00:00-0600
Expected:
-0001-06-17T00:00:00-0600
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