[Swiftz]

I want to make this command, To make someone leader for specific amount of time (in days) . If the define is playerinf(leader) = 0 (For not leader) 1 for leader. So if the time ends. It should automatically bcum playerinf(leader) = 0. leader variable will be ofcourse stored in userfiles. So how to make this? i think we need to store the days in a file and something, Please help