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Count how many days

If you have a date from x to y, and you want to count how many days from that date, you can use function strtotime at php.
You can try like below:

$from = "2007-05-1";
$to = "2007-05-3";
$day =floor((strtotime($from)-strtotime($to))/86400);
print $day;

86400 is seconds in a day (24 hours x 60 minutes x 60 seconds).
If you count that date, your result will be 2 days.

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