A datetime's day of the week.
An integer between 1 and 7: 1 = Monday, 7 = Sunday.
|Datetime||A datetime in OI internal format. (REQUIRED)|
The "DayOfWeek" service returns the day of the week of an OI datetime. The day of the week is returned as an integer between 1 and 7, with 1 being Monday and 7 being Sunday. For example, if an OI datetime represents March 30, 1978 at 12:41:08 pm, this service would return 4, since that datetime falls on a Thursday. If the given datetime is not valid, "" is returned.