Date function to display all dates between two dates

You can check out this function also

        $day = 86400; // Day in seconds  
        $format = 'Y-m-d'; // Output format (see PHP date funciton)  
        $sTime = strtotime($start_date); // Start as time  
        $eTime = strtotime($end_date); // End as time  
        $numDays = round(($eTime - $sTime) / $day) + 1;  
        $days = array();  

        for ($d = 0; $d < $numDays; $d++) {  
            $days[] = date($format, ($sTime + ($d * $day)));  
        }  

There is the DatePeriod class.

EXAMPLE:

$begin = new DateTime('2013-02-01');
$end = new DateTime('2013-02-13');

$daterange = new DatePeriod($begin, new DateInterval('P1D'), $end);

foreach($daterange as $date){
    echo $date->format("Y-m-d") . "<br>";
}

(P1D stands for period of one day, see DateInterval for further documentation)