This option is only available if the Accrual Calculation Method is Month. If selected, accrued rent and interest expense are calculated using 30-day months (with no activity on the 31st day of a month), which makes the daily activity the same whether a month has 30 or 31 days. If not selected, accrued rent and interest are divided evenly over the number of days in the current calendar month. Checking this option makes for more consistent recognition of rent accrual, including operating rent expense on non-leveled leases, when leases are paid in the middle of the month but your normal report period end date is the end of the month.