Precise to the month and year, date. Sets aggregation period equal to one calendar month. If you need stats to be detailed for a month, you can activate present selector and disable all others related to dates.
To build a report regardless of the calendar month (Jan-Dec), use the 30-day period dimension.
For Flow metrics this is a month when event occurred
For lifetime (LT) metrics this is a month when new device or new user appeared
