This post is about How to add and subtract dates from one another.
For example, this simple code can calculate what the date will be 5 weeks before or after from any specific date like: 2016-01-06 (yyyy-mm-dd).
Subtracting days from a date
The following example will subtract 2 days from 2016-01-06.
$Date = "2016-01-06";
$sub_newdate = date('Y-m-d', strtotime($Date. ' - 2 day'));
Adding days into a date
$add_newdate = date('Y-m-d', strtot...