Answer 1

$to = \Carbon\Carbon::createFromFormat('Y-m-d H:s:i', '2015-5-5 3:30:34');

$from = \Carbon\Carbon::crea teFromFormat('Y-m-d H:s:i', '2015-5-6 9:30:34');

$diff_in_days = $to->diffInDays($from);

print_r($diff_in_days);

Here's the script to do so with carbon