def ISO_DAY_OF_WEEK(expression):
return {'<STR_LIT>': expression}<EOL>
Returns the weekday number in ISO 8601 format, ranging from 1 (for Monday) to 7 (for Sunday).
See https://docs.mongodb.com/manual/reference/operator/aggregation/isoDayOfWeek/
for more details
:param expression: expression or variable of a Date, a Timestamp, or an ObjectID
:return: Aggregation operator