Depreciation Calculation: per day owned or per year?

[Chris Conde]

Hi all, So I bought an investment property 4 days before the end of the year in 2017. When I calculate depreciation is it based on the days owned in that year or by the year? So to use a very simple math example: if a full year's depreciation (house value, closing cost, less land, etc. / 27.5) is $365 then 4 days of ownership would allow me $4 of depreciation or do i use the full $365?

Thanks!

Beck