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Bug #55792 strtotime("-1 month");
Submitted: 2011-09-27 02:13 UTC Modified: 2011-11-21 17:15 UTC
Votes:2
Avg. Score:3.0 ± 0.0
Reproduced:2 of 2 (100.0%)
Same Version:1 (50.0%)
Same OS:0 (0.0%)
From: fjm20016 at 163 dot com Assigned: danielc (profile)
Status: Not a bug Package: Date/time related
PHP Version: 5.3.8 OS: windows
Private report: No CVE-ID: None
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 [2011-09-27 02:13 UTC] fjm20016 at 163 dot com 
Description:
------------
I often use strtotime, I won't change my program anywhere.
+1 month -1 month maybe as expected

Test script:
---------------
date("Y-m-d H:i:s", strtotime("-1 month", strtotime("2011-05-31 00:00:00")));
//2011-05-01 as expected
//2011-04-30 I Like

date("Y-m-d H:i:s", strtotime("+1 month", strtotime("2011-05-31 00:00:00")));
//2011-07-01 as expected
//2011-06-30 I Like


date("Y-m-d H:i:s", strtotime("-1 month", strtotime("2011-03-31 00:00:00")));
//2011-03-03 as expected
//2011-02-28 I Like

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 [2011-09-27 10:06 UTC] cataphract@php.net
-Package: *Data Exchange functions +Package: Date/time related
 [2011-11-21 17:15 UTC] danielc@php.net 
1) Use the add(), sub() or modify() DateTime methods for date math.

2) Adding months to dates on or after the 29th of the month is unreliable, as you've found.  When performing such operations, an advisable approach is changing the date to the first day of the month, add or subtract the number of months desired, than change the date to the last day of that month.
 [2011-11-21 17:15 UTC] danielc@php.net
-Status: Open +Status: Bogus -Assigned To: +Assigned To: danielc
 
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