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Bug #78091 DateTime - subtraction of 1 month return first day of actual month
Submitted: 2019-05-31 11:27 UTC Modified: 2019-05-31 12:38 UTC
From: jan dot zenisek at outlook dot com Assigned:
Status: Not a bug Package: Date/time related
PHP Version: Irrelevant OS: Win 10 / Ubuntu Server
Private report: No CVE-ID: None
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 [2019-05-31 11:27 UTC] jan dot zenisek at outlook dot com 
Description:
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DateTime->modify

When I subtract 1 month from new DateTime (today is 5th May 2019), I got wrong Date (1st May 2019) but I was expecting April.

Test script:
---------------
var_dump((new \DateTime())->modify('-1 months'));

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 [2019-05-31 12:38 UTC] requinix@php.net
-Status: Open +Status: Not a bug
 [2019-05-31 12:38 UTC] requinix@php.net 
Assuming you mean today is the 31st,

May 31 - 1 month = April 31, which overflows to May 1.
 
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