$subscriptionDate is a date value retrieved from a database table. Its format is yyyy-mm-dd hh:mm:ss
The time is irrelevant for my needs.
I've been playing with the code you showed me the other day but couldn't seem to get the variable to fit in it so things worked.
<?php date("Y-m-d, mktime(0,0,0,date("Y"),date("m"),date("d")+90)); ?>