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<?php $start = new DateTime('2014-01-07', new DateTimeZone('UTC')); $end = clone $start; $start->sub(new DateInterval('P1M')); // substract one month echo $start->format('Y-m-d').' - '.$end->format('Y-m-d'); // 2013-12-07 - 2014-01-07 - seems correct, let's get number of days... print_r($end->diff($start)); // DateInterval Object ( [y] => 0 [m] => 2 [d] => 0 [h] => 0 [i] => 0 [s] => 0 [invert] => 1 [days] => 61 )
Output for 7.1.0
2013-12-07 - 2014-01-07DateInterval Object ( [y] => 0 [m] => 1 [d] => 0 [h] => 0 [i] => 0 [s] => 0 [f] => 0 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 1 [days] => 31 [special_type] => 0 [special_amount] => 0 [have_weekday_relative] => 0 [have_special_relative] => 0 )
Output for 5.3.27 - 5.3.29, 5.4.17 - 5.6.28, 7.0.0 - 7.0.14
2013-12-07 - 2014-01-07DateInterval Object ( [y] => 0 [m] => 1 [d] => 0 [h] => 0 [i] => 0 [s] => 0 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 1 [days] => 31 [special_type] => 0 [special_amount] => 0 [have_weekday_relative] => 0 [have_special_relative] => 0 )
Output for hhvm-3.10.0 - 3.12.0
2013-12-07 - 2014-01-07DateInterval Object ( )
Output for 5.3.3 - 5.3.26, 5.4.0 - 5.4.16
2013-12-07 - 2014-01-07DateInterval Object ( [y] => 0 [m] => 1 [d] => 0 [h] => 0 [i] => 0 [s] => 0 [invert] => 1 [days] => 31 )
Output for 5.3.0 - 5.3.2
2013-12-07 - 2014-01-07DateInterval Object ( [y] => 0 [m] => 2 [d] => 0 [h] => 0 [i] => 0 [s] => 0 [invert] => 1 [days] => 61 )
Output for 5.2.0 - 5.2.17
Fatal error: Call to undefined method DateTime::sub() in /in/76XK2 on line 5
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.1 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/76XK2 on line 3
Process exited with code 255.
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/76XK2 on line 11
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_VARIABLE in /in/76XK2 on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_VARIABLE in /in/76XK2 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/76XK2 on line 4
Process exited with code 255.