Calculate days between dates in php

calculate-day-between-dates.php

<?php

function calculateDaysBetweenDates() {
	// set time zone to karachi
	date_default_timezone_set('Asia/Karachi');
	$startDate = new DateTime( 'last thursday' );
	$endDate   = new DateTime( 'today' );
	$interval  = $startDate->diff( $endDate );

	return $interval->format( '%a' );
}

echo calculateDaysBetweenDates();