Possible Duplicate:
PHP date() and strtotime() return wrong months on 31st
I have this code and it outputs something strange i think. So, what i am doing wrong here.
<?php
$sP1 = date('m Y');
$sP2 = date('m Y', strtotime('+01 month'));
$sP3 = date('m Y', strtotime('+02 month'));
$sP4 = date('m Y', strtotime('+03 month'));
echo $sP1.'<br>';
echo $sP2.'<br>';
echo $sP3.'<br>';
echo $sP4.'<br>';
?>
and this outputs
05 2012
07 2012
07 2012
08 2012
i think the second one should be
06 2012
Anybody know any solution?
Today is the 31st next month only has 30 days so it would be 7/12 in 1 month from today
assuming that today is May 31 2012
date('m Y') == 05 2012
date('m Y', strtotime('+1 month')) == 07 2012 because june has 30 days
date('m Y', strtotime('+2 month')) == 07 2012
date('m Y', strtotime('+3 month')) == 08 2012
date('m Y', strtotime('+4 month')) == 10 2012
I would take today's date and find the first day of the month then add a month to that if you are doing something that needs to get each month
It is working as intended. In a nutshell, it is because what is "one month" from May 31? June 30? August 1?
My suggestion is that if you need sequential months, calculate the offset from the start of the current month, not the current day. Or compose the date that you're looking for manually using the month, day, and year parts broken up.
As others have said, it is because today is the 31st and +1 month equals June-31 which changes to Jul-1. If you include the day in the date string, you can see exactly this.
<?php
$sP1 = date('m-d-Y');
$sP2 = date('m-d-Y', strtotime('+01 month'));
$sP3 = date('m-d-Y', strtotime('+02 month'));
$sP4 = date('m-d-Y', strtotime('+03 month'));
echo $sP1."
";
echo $sP2."
";
echo $sP3."
";
echo $sP4."
";
/* Outputs:
05-31-2012
07-01-2012
07-31-2012
08-31-2012
*/
?>
strtotime though can take the start date as part of the string so as King suggested, calculate the +N months from the first. So a string like May-1-2012 +01 month such as:
<?php
$sP1 = date('m Y');
$sP2 = date('m Y', strtotime(date('M-1-Y').' +01 month'));
$sP3 = date('m Y', strtotime(date('M-1-Y').' +02 month'));
$sP4 = date('m Y', strtotime(date('M-1-Y').' +03 month'));
echo $sP1."
";
echo $sP2."
";
echo $sP3."
";
echo $sP4."
";
/* Outputs:
05 2012
06 2012
07 2012
08 2012
*/
?>