How do you claim mortgage interest on Schedule E for property that was converted to rental for 184 days of the year? The full amount from 1098 or basically half of that?

I think I made a mistake on my Schedule E form for last year's return after starting to do this year's taxes.  I would like to know how to calculate the amount of mortgage interest that I should list on the Schedule E if my home was personal for 180 days and converted to rental for 184 days.