Date period

Period of 7 or 30 days. The stats would be detailed for fixed length intervals counted from the last date of the report period.

Unlike Week and Month selectors, 7-day and 30-day periods have always constant length and don't associate calendar periods. So you can exclude errors with different number of days in a month (28-31) or lack of data on the coming days when you calculate in the middle of the current Week/Month.