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<?php $foo = '2011-3-31 00:00:00'; $date = new DateTime($foo); $date->modify('-1 month'); var_dump($date); $new_month = $date->format('m'); $new_day = $date->format('d'); $new_year = $date->format('Y'); $last_month_timestamp = mktime(0, 0, 0, $new_month, $new_day, $new_year); $num_days_last_month = date('t', $last_month_timestamp); $days_offset = $num_days_last_month - $new_day; $date = $date->modify('' . $days_offset . ' days'); var_dump($date);
Output for git.master, git.master_jit, rfc.property-hooks
object(DateTime)#1 (3) { ["date"]=> string(26) "2011-03-03 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } object(DateTime)#1 (3) { ["date"]=> string(26) "2011-03-31 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }

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