Answer Posted / sachin

If we know the date format and separator used in dates,
we can separate them out into day, month and year.
e.g.

$d1 = '29-12-1985'; //dd-mm-yyyy
$d2 = '31-12-1985'; //dd-mm-yyyy

$d1_pieces = explode('-',$d1);
$d2_pieces = explode('-',$d2);

$timestamp_d1 =
mktime(0,0,0,$d1_pieces[1],$d1_pieces[0],$d1_pieces[2],);

$timestamp_d2 =
mktime(0,0,0,$d2_pieces[1],$d2_pieces[0],$d2_pieces[2],);

$diff = $d1-$d2;

$num_days = $diff/(24*60*60);

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