After PHP 5.3, we can use DateInterval object or date_interval_create_from_date_string() function to add or subtract days,weeks,months or years to or from a DateObject.But prior to PHP 5.3,we cannot do this. If we want to achieve the same effect. We need to use some skills. Here is one:We can use strtotime() function to achieve this. For example:$date=date('Y-m-d',time());$datestamp=strtotime(date('Y-m-d',strtotime($date)).' +1 day'); $datestamp=strtotime(date('Y-m-d',strtotime($date)).' +1 week');  $datestamp=strtotime(date('Y-m-d',strtotime($date)).' +1 month');  Her...

DateInterval is (amongst others) a relatively new addition to the date extension in PHP 5.3. It allows to describe an interval in time, and you can perform actions with that interval. Basically, it allows to calculate with dates in a very easy way, and do even more fun stuff with it.Unfortunately no documentation exists today for DateInterval and friends, but PHP is open-source so you can easily have a peek at the code to see what’s happening under the engine. This is more or less what the documentation for DateInterval and some helper functions could look like:Prototype:DateInterval Da...