Are there additional formulas for Zoho Forms? If not, how would you create a formula to find a date that is X amount of weeks from a set date?

Are there additional formulas for Zoho Forms? If not, how would you create a formula to find a date that is X amount of weeks from a set date?

I'm building a form where I need to get an output date of 52 weeks from the input date.  I'm finding that Zoho Forms is limited in the date formulas allowed (unless I'm missing something).  Seems like I may be able to use Zoho Creator for this (also not sure on the integration between Creator and Forms or if there is any).  

My questions are if there is a formula that I could use for this in Zoho Forms and if not, what would the formula be for Zoho Creator?