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<?php $a = new \DateTime('2016-03-01', new \DateTimeZone('Europe/Warsaw')); $b = new \DateTime('2016-03-31', new \DateTimeZone('Europe/Warsaw')); $d = $a->diff($b); var_dump($d); $a1 = new \DateTime('2016-05-01', new \DateTimeZone('Europe/Warsaw')); $b1 = new \DateTime('2016-05-31', new \DateTimeZone('Europe/Warsaw')); $d1 = $a1->diff($b1); var_dump($d1); $a2 = new \DateTime('2016-04-01', new \DateTimeZone('Europe/Warsaw')); $b2 = new \DateTime('2016-04-30', new \DateTimeZone('Europe/Warsaw')); $d2 = $a2->diff($b2); var_dump($d2); $a3 = new \DateTime('2016-06-01', new \DateTimeZone('Europe/Warsaw')); $b3 = new \DateTime('2016-06-30', new \DateTimeZone('Europe/Warsaw')); $d3 = $a3->diff($b3); var_dump($d3); $a4 = new \DateTime('2016-07-01', new \DateTimeZone('Europe/Warsaw')); $b4 = new \DateTime('2016-07-31', new \DateTimeZone('Europe/Warsaw')); $d4 = $a4->diff($b4); var_dump($d4);
based on 8Y9iG
Output for 7.1.0 - 7.3.0beta1
object(DateInterval)#3 (16) { ["y"]=> int(0) ["m"]=> int(1) ["d"]=> int(1) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["f"]=> float(0) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(0) ["invert"]=> int(0) ["days"]=> int(30) ["special_type"]=> int(0) ["special_amount"]=> int(0) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) } object(DateInterval)#6 (16) { ["y"]=> int(0) ["m"]=> int(1) ["d"]=> int(0) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["f"]=> float(0) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(0) ["invert"]=> int(0) ["days"]=> int(30) ["special_type"]=> int(0) ["special_amount"]=> int(0) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) } object(DateInterval)#9 (16) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(29) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["f"]=> float(0) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(0) ["invert"]=> int(0) ["days"]=> int(29) ["special_type"]=> int(0) ["special_amount"]=> int(0) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) } object(DateInterval)#12 (16) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(29) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["f"]=> float(0) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(0) ["invert"]=> int(0) ["days"]=> int(29) ["special_type"]=> int(0) ["special_amount"]=> int(0) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) } object(DateInterval)#15 (16) { ["y"]=> int(0) ["m"]=> int(1) ["d"]=> int(0) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["f"]=> float(0) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(0) ["invert"]=> int(0) ["days"]=> int(30) ["special_type"]=> int(0) ["special_amount"]=> int(0) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) }
Output for 5.3.27 - 5.3.29, 5.4.17 - 7.0.20
object(DateInterval)#3 (15) { ["y"]=> int(0) ["m"]=> int(1) ["d"]=> int(1) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(0) ["invert"]=> int(0) ["days"]=> int(30) ["special_type"]=> int(0) ["special_amount"]=> int(0) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) } object(DateInterval)#6 (15) { ["y"]=> int(0) ["m"]=> int(1) ["d"]=> int(0) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(0) ["invert"]=> int(0) ["days"]=> int(30) ["special_type"]=> int(0) ["special_amount"]=> int(0) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) } object(DateInterval)#9 (15) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(29) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(0) ["invert"]=> int(0) ["days"]=> int(29) ["special_type"]=> int(0) ["special_amount"]=> int(0) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) } object(DateInterval)#12 (15) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(29) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(0) ["invert"]=> int(0) ["days"]=> int(29) ["special_type"]=> int(0) ["special_amount"]=> int(0) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) } object(DateInterval)#15 (15) { ["y"]=> int(0) ["m"]=> int(1) ["d"]=> int(0) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(0) ["invert"]=> int(0) ["days"]=> int(30) ["special_type"]=> int(0) ["special_amount"]=> int(0) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) }
Output for 5.3.23 - 5.3.26, 5.4.13 - 5.4.16
object(DateInterval)#3 (8) { ["y"]=> int(0) ["m"]=> int(1) ["d"]=> int(1) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["invert"]=> int(0) ["days"]=> int(30) } object(DateInterval)#6 (8) { ["y"]=> int(0) ["m"]=> int(1) ["d"]=> int(0) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["invert"]=> int(0) ["days"]=> int(30) } object(DateInterval)#9 (8) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(29) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["invert"]=> int(0) ["days"]=> int(29) } object(DateInterval)#12 (8) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(29) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["invert"]=> int(0) ["days"]=> int(29) } object(DateInterval)#15 (8) { ["y"]=> int(0) ["m"]=> int(1) ["d"]=> int(0) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["invert"]=> int(0) ["days"]=> int(30) }