Edit report at https://bugs.php.net/bug.php?id=62984&edit=1
ID: 62984
Updated by: ahar...@php.net
Reported by: eyre dot jonathan at gmail dot com
Summary: "-1 month" in date moves day 31 to day 1 in the same
month.
-Status: Open
+Status: Duplicate
Type: Bug
Package: Date/time related
Operating System: Debian Linux
PHP Version: 5.3.16
Block user comment: N
Private report: N
New Comment:
Expected behaviour. Duplicate of bug #22486, bug #44073, bug #62980, and
probably about fifty other bugs in the tracker.
Previous Comments:
------------------------------------------------------------------------
[2012-08-31 16:32:28] eyre dot jonathan at gmail dot com
Description:
------------
When looping backwards in time using the "-1 Month" feature of date(), July is
printed twice. This actually occurs whenever $finalEndDate is a month with 31
days.
The "-1 Month" syntax does not work when the date is the 31st of the month. It
apparently tries to set July 31 to June 31, which does not exist. The 31st of
June is calculated to be July 1st, hence the double printing of July 2012 in
the example below.
Test script:
---------------
$finalEndDate = "8/31/2012";
$finalStartDate = "12/31/2010";
$StartTime = strtotime($finalStartDate); //$StartDateDB);
$EndTime = strtotime($finalEndDate); //$EndDateDB);
$StartMark = getdate($StartTime);
$EndMark = getdate($EndTime);
$u = 0;
while ($StartTime <= $EndTime) {
$MonthString = $EndMark["month"] . " " . $EndMark["year"];
echo "comparing [" . $StartTime . "] to [" . $EndTime . "]... created[" .
$MonthString . "]<BR>\n";
$u++;
$EndTime = strtotime("-1 month", $EndTime); // THIS IS THE BUGGY LINE
$EndMark = getdate($EndTime);
}
Expected result:
----------------
comparing [1338440400] to [1346389200]... created[August 2012]
comparing [1338440400] to [1343710800]... created[July 2012]
comparing [1338440400] to [1338526800]... created[June 2012]
Actual result:
--------------
comparing [1338440400] to [1346389200]... created[August 2012]
comparing [1338440400] to [1343710800]... created[July 2012]
comparing [1338440400] to [1341118800]... created[July 2012]
comparing [1338440400] to [1338526800]... created[June 2012]
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=62984&edit=1
