Lease Agreement - Prorated Rent

[Tony Castronovo]

What is the proper way to structure a lease agreement to handle prorated rent?  If I have someone moving in on 9/23, should I make the lease commencement date 9/23/16 through 9/30/17 (slightly more than 12 months) and just prorate the rent?  Or is it best to structure the lease precisely at 12 months and add a proration clause.  I am thinking the former since the terms of the lease should apply on the move-in date.  But just didn't know if there was some taboo on lease terms being slightly more/less than a standard 6/12/24 month arrangement.