$startDate = '1999-03-12'; $endDate = '2011-03-12'; $days = (strtotime($endDate)-strtotime($startDate)) / (60 * 60 * 24); echo $days; //Will output 4383
In the above example we have a startdate and a enddate. We need to find out how many days are between the startdate and the enddate.
We convert both dates to a UNIX Timestamp using the strtotime PHP function.
After the conversion we substract the startdate from the endate and then divide it by the number of seconds in a day (60*60*24).
We then output the day difference between 2 dates by using the echo PHP command.