Returns the year number in ISO 8601 format. The year starts with the Monday of week 1 (ISO 8601) and ends with the Sunday of the last week (ISO 8601).
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/isoWeekYear/#mongodb-expression-exp.-isoWeekYear
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Returns the year number in ISO 8601 format. The year starts with the Monday of week 1 (ISO 8601) and ends with the Sunday of the last week (ISO 8601).