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<?php var_dump( date('r', mktime(0, 0, 0, 10-7, 29, 2013) ), date('r', mktime(0, 0, 0, 10-8, 29, 2013) ) );
Output for 4.3.11 - 4.4.9, 5.0.4 - 7.1.0
string(31) "Fri, 29 Mar 2013 00:00:00 +0100" string(31) "Fri, 01 Mar 2013 00:00:00 +0100"
Output for 4.3.0 - 4.3.10, 5.0.0 - 5.0.3
string(31) "Fri, 29 Mar 2013 00:00:00 +0100" string(31) "Fri, 1 Mar 2013 00:00:00 +0100"