The day of the week with Monday=0, Sunday=6.
Return the day of the week. It is assumed the week starts on
Monday, which is denoted by 0 and ends on Sunday which is denoted
by 6. This method is available on both Series with datetime
values (using the dt accessor) or DatetimeIndex.
Containing integers indicating the day number.
Returns the name of the day of the week.
>>> idx = ps.date_range('2016-12-31', '2017-01-08', freq='D')
Int64Index([5, 6, 0, 1, 2, 3, 4, 5, 6], dtype='int64')