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Type:
New Feature
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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: Aggregation Framework
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Query
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Query 12 (04/04/16), Query 13 (04/22/16)
Syntax
{$newDate: [<year>, <month>, <day>, <hour>, <minutes>, <seconds>, <millis>]}
Examples
db.coll.insert([
{_id: 0, year: 2016, month: 1, day: 1, hour: 5, minutes: 0, seconds: 0, millis: 0}
]);
> db.coll.aggregate([{
$project: {
_id: 0
date: {$newDate: [
"$year",
"$month",
"$day",
"$hour",
"$minutes",
"$seconds",
"$millis"
]}
}
}]);
{date: ISODate("2016-01-01T05:00:00:000Z")}
// Example 2 - Truncate a date to only year/month/day. Note this can be very useful in a
// $group, so that you can combine all sales on a given day, or something like that.
> db.coll.insert([
{_id: 0, date: new IsoDate()}
]);
> db.coll.aggregate([{
$project: {
truncatedDate: {
$newDate: [
{$year: "$date"},
{$month: "$date"},
{$dayOfMonth: "$date"}
]
}
}
}])
{truncatedDate: ISODate("2016-04-06T00:00:00:000Z")}
// Example 3 - Create a date from milliseconds.
> db.coll.insert([
{_id: 0 millis: 1451624400000}
]);
> db.coll.aggregate([{
$project: {
date: {$newDate: [1970, 1, 1, 0, 0, 0, "$millis"]} // "$millis" will overflow.
}
}])
{date: ISODate("2016-01-01T05:23:00:000Z")}
Notes
- $newDate can accept anywhere from 1 to 7 arguments. If fewer than seven are specified, the remaining values are filled with zero.
- Values that are too large should carry. For example, day: 0, hour: 24 is equivalent to day: 1, hour: 0
- Negative values should "subtract". For example, day: 2, hour: -1 is equivalent to day: 1, hour 23
Errors
- If an input is not integral.
- if more than 7 or fewer than 1 elements are passed in
Old Description
A new data aggregation operator that returns a date from other forms/composite parts.
It could look something like:
{ $date: <expression> }
Where <expression> evaluates to a number or a string.
- If a string conforms to the ISODate format such as "2014-11-28T16:09:53.082Z"
- If a number, represents milliseconds since the epoch.
Or it could be from the constituent parts.
{ $date: { year: <expression>, month: <expression>, day: <expression>, hours: <expression>, minutes: <expression>, seconds: <expression>, milliseconds: <expression> } }
This would mean that grouping data by a given calendar day could be (example taken from Stupid date tricks with Aggregation Framework)
db.coll.aggregate([
{
$project: {
"type" : 1,
"PINGS" : 1,
"_id" : 0,
date: { $date: {
year: {$year: "$time"},
month: {$month: "$time"},
day: {$day: "$time"},
hours: 0,
minutes: 0,
seconds: 0,
milliseconds: 0 } }
}
}
,
{"$group" : {
"_id" : {
"type" : "$type",
"dt" : "$date"
},
"total" : {
"$sum" : "$PINGS"
},
"cnt" : {
"$sum" : 1
}
}
}
])
- duplicates
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SERVER-28613 Add the $dateToParts and $dateFromParts A/F operators
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- Closed
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- is duplicated by
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SERVER-9626 Aggregation Framework needs to support more date conversion functions like date portion, or time portion of date type
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- Closed
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- is related to
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SERVER-30523 dateFromParts should not reject "out-of-range" numbers for date/time properties
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- Closed
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