Date modify

This is another way to add or subtract a date object with different month , days ,year , hour , minutes , sec etc.
This function is supported by PHP 5.2 or higher versions. So if you are running 5.2 version the you can use modify function as add or subtract functions are supported by PHP 5.3 and higher only.
How to know PHP version ?
Here is an example on how to use modify function.
date_default_timezone_set ("Asia/Kolkata");
$date1=new DateTime("now") ;
echo $date1->format('d-m-Y');
echo "<br>";
$date2=$date1->modify('+5 day');
 echo $date2->format('d-m-Y');
The output is here
We can change the highlighted line like this
$date2=$date1->modify('+3 month +5 day -1 year ');
Output of this change is here

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