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Type:
Task
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Resolution: Duplicate
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Priority:
Major - P3
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None
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Affects Version/s: None
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Component/s: None
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Labels:
Engineering Ticket Description:
We've decided to add the following operators:
- $isoWeek
- $isoDayOfWeek
- $isoWeekYear
And to add the corresponding substitutions "%G", "%V", and "%u" to the $dateToString expression.
Example
Input
{_id: 0, date: ISODate("2016-01-01T00:00:00Z")} // Thu, Jan 1, 2016
Pipeline
db.coll.aggregate([{
$project: {
dayOfWeek: {$dayOfWeek: "$date"},
isoDayOfWeek: {$isoDayOfWeek: "$date"},
year: {$year: "$date"},
isoYear: {$isoWeekYear: "$date"},
week: {$week: "$date"},
isoWeek: {$isoWeek: "$date"},
isoString: {$dateToString: {format: "%G-W%V-%u", date: "$date"}}
}
}])
Output
{
_id: 0,
dayOfWeek: 6, // 1 is Sunday, 7 is Saturday
isoDayOfWeek: 5, // 1 is Monday, 7 is Sunday
year: 2016,
isoYear: 2015, // 2016 starts on Jan 4th under ISO calendar.
week: 0,
isoWeek: 53,
isoString: "2015-W53-5" // $dateToString is also modified to support
// the concepts above.
}
Additional Notes
- See the wikipedia article on the ISO-8601 standard.
- Throws an error if the input is not a Date
Original Description
It would be very useful for $week to have an option to start from Monday. Get it from current locale, is first that came in my mind.
- documents
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SERVER-7695 Add variants of $week, $year, $dayOfWeek that conform to the ISO-6801 spec
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- Closed
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