Returns the weekday number in ISO 8601 format, ranging from 1 (for Monday) to 7 (for Sunday).
The date to which the operator is applied. must be a valid expression that resolves to a Date, a Timestamp, or an ObjectID.
Optional
The timezone of the operation result. must be a valid expression that resolves to a string formatted as either an Olson Timezone Identifier or a UTC Offset. If no timezone is provided, the result is displayed in UTC.
3.4
https://www.mongodb.com/docs/manual/reference/operator/aggregation/isoDayOfWeek/#mongodb-expression-exp.-isoDayOfWeek
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Returns the weekday number in ISO 8601 format, ranging from 1 (for Monday) to 7 (for Sunday).