Returns the milliseconds of a date as a number between 0 and 999.
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.
https://www.mongodb.com/docs/manual/reference/operator/aggregation/millisecond/#mongodb-expression-exp.-millisecond
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Returns the milliseconds of a date as a number between 0 and 999.