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<?php $date_start = new DateTime('2017-03-01'); $date_end = new DateTime('2017-03-31'); print_r($date_start->diff($date_end));
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.27, 7.4.0 - 7.4.15, 8.0.0 - 8.0.2
DateInterval Object ( [y] => 0 [m] => 1 [d] => 2 [h] => 0 [i] => 0 [s] => 0 [f] => 0 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 0 [days] => 30 [special_type] => 0 [special_amount] => 0 [have_weekday_relative] => 0 [have_special_relative] => 0 )
Output for 7.0.0 - 7.0.20
DateInterval Object ( [y] => 0 [m] => 1 [d] => 2 [h] => 0 [i] => 0 [s] => 0 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 0 [days] => 30 [special_type] => 0 [special_amount] => 0 [have_weekday_relative] => 0 [have_special_relative] => 0 )