$isoWeekYear (aggregation)
On this page
Definition
-
$isoWeekYear
-
New in version 3.4.
Returns the year number in ISO 8601 format. The year starts with the Monday of week 1 and ends with the Sunday of the last week.
The
$isoWeekYear
expression has the following operator expression syntax:Changed in version 3.6.
The argument must be a valid expression that resolves to one of the following:
A document of the following form:
New in version 3.6.
Field Description date
The date to which the operator is applied. <dateExpression>
must be a valid expression that resolves to a Date, a Timestamp, or an ObjectID.timezone
Optional.
The timezone of the operation result.<tzExpression>
must be a valid expression that resolves to a string formatted as either an Olson Timezone Identifier or a UTC Offset . If notimezone
is provided, the result is displayed inUTC
.Format
Examples
Olson Timezone Identifier "America/New_York" "Europe/London" "GMT"
UTC Offset +/-[hh]:[mm], e.g. "+04:45" +/-[hh][mm], e.g. "-0530" +/-[hh], e.g. "+03"
Behavior
Example | Result |
---|---|
2015 | |
2003 | |
2017 | |
2016 | |
2024 | |
error |
|
error |
|
error |
Note
$isoWeekYear
cannot take a string as an argument.