The ‘Day’ dimension reports the day that a given metric occurred. The first dimension item is the first day in the date range, and the last dimension item is the last day in the date range. This dimension is vital for trended reports, as it allows you to see metrics over time.
This dimension works out of the box for all implementations. If a report suite contains data, this dimension works.
Dimension items include the date of a given day. It includes the month, day, and year as part of the dimension item.