Typically...alll cosmetics and creams, lotions, potions etc. have an average shelf life of 6 months after you have OPENED it and have began to use it.
There are however a few exceptions which would be things like...has there been more than one user...does it have active ingredients...organic...not organic. Those are things to consider as well.
One of the best ways to tell if it is time to toss it is....does it have a funky smell...or has the smell of it changed at all...is it seperating....or have a change in color??
Those are just basic guidelines...you could probably shoot out an email to the company and ask them directly though as well.