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run code in 150+ php & hhvm versions
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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 $start->format('r').' - '.$end->format('r'); print_r($end->diff($start)); print_r($start->diff($end));
Output for 7.1.0
Sat, 07 Dec 2013 00:00:00 +0000 - Tue, 07 Jan 2014 00:00:00 +0000DateInterval 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 ) DateInterval 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] => 0 [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
Sat, 07 Dec 2013 00:00:00 +0000 - Tue, 07 Jan 2014 00:00:00 +0000DateInterval 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 ) DateInterval Object ( [y] => 0 [m] => 1 [d] => 0 [h] => 0 [i] => 0 [s] => 0 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 0 [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
Sat, 07 Dec 2013 00:00:00 +0000 - Tue, 07 Jan 2014 00:00:00 +0000DateInterval Object ( ) DateInterval Object ( )
Output for 5.3.3 - 5.3.26, 5.4.0 - 5.4.16
Sat, 07 Dec 2013 00:00:00 +0000 - Tue, 07 Jan 2014 00:00:00 +0000DateInterval Object ( [y] => 0 [m] => 1 [d] => 0 [h] => 0 [i] => 0 [s] => 0 [invert] => 1 [days] => 31 ) DateInterval Object ( [y] => 0 [m] => 1 [d] => 0 [h] => 0 [i] => 0 [s] => 0 [invert] => 0 [days] => 31 )
Output for 5.3.0 - 5.3.2
Sat, 07 Dec 2013 00:00:00 +0000 - Tue, 07 Jan 2014 00:00:00 +0000DateInterval Object ( [y] => 0 [m] => 2 [d] => 0 [h] => 0 [i] => 0 [s] => 0 [invert] => 1 [days] => 61 ) DateInterval Object ( [y] => 0 [m] => 3 [d] => 0 [h] => 0 [i] => 0 [s] => 0 [invert] => 0 [days] => 92 )
Output for 5.2.0 - 5.2.17
Fatal error: Call to undefined method DateTime::sub() in /in/4Dd8C on line 5
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/4Dd8C on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_VARIABLE in /in/4Dd8C 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/4Dd8C on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/4Dd8C on line 4
Process exited with code 255.