XF 2.3 Fixed subscription dates

[AndreaMarucci]

Hello, is there a way to make the subscription date fixed. Now if a user upgrade, that upgrade last for a fixed amount of months, eg. 12/24 and so on. I'd like to know if I can set that all the upgrades are from a date x to a date y so that every upgrade, no matter when it's done, expires at a fixed date.

Thanks!