datetime - PHP. Why does date object diff on month reset to 0 after 12 months? -


today 2015-07-08.

when run following returns 0. should not return 12? date 12 months ago. if $date='2014-06-03' returns 1. should not 13? dates within last 12 months calculated correctly. 

 $date = '2014-07-03';  $datetime1 = new datetime(date('y-m-01', strtotime($date)));  $datetime2 = new datetime(date('y-m-d'));        $interval = $datetime1->diff($datetime2);  $months_ago = $interval->format('%m');  echo "\n".$months_ago;

thank you

the date 1 year , 0 months ago, not 12 months ago. if see year you'd that.

note:

the dateinterval::format() method not recalculate carry on points in time strings nor in date segments. expected because not possible overflow values "32 days" interpreted "1 month , 4 days" "1 month , 1 day".

you can use %a total number of days can't find marker total number of months.

reference


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