Mongodb aggregate: convert date to another timezone
As an update, MongoDB 3.6 has a new timezone parameter for date manipulation in the aggregation framework. Most date-related operators accept this optional parameter, see $hour for one example.
For example, if we have a document where the date is exactly the new year in UTC:
> db.test.find(){"_id": 1, "dt": ISODate("2018-01-01T00:00:00Z")}We can display the date in New York timezone:
> db.test.aggregate([... {$project:{... date:{$dayOfMonth:{date:'$dt',timezone:'America/New_York'}},... month:{$month:{date:'$dt',timezone:'America/New_York'}},... year:{$year:{date:'$dt',timezone:'America/New_York'}},... hour:{$hour:{date:'$dt',timezone:'America/New_York'}}... }}... ]){ "_id": 1, "date": 31, "month": 12, "year": 2017, "hour": 19 }We can also display the date in Sydney timezone:
> db.test.aggregate([... {$project:{... date:{$dayOfMonth:{date:'$dt',timezone:'Australia/Sydney'}},... month:{$month:{date:'$dt',timezone:'Australia/Sydney'}},... year:{$year:{date:'$dt',timezone:'Australia/Sydney'}},... hour:{$hour:{date:'$dt',timezone:'Australia/Sydney'}}... }}... ]){ "_id": 1, "date": 1, "month": 1, "year": 2018, "hour": 11 }The timezone description is using the standard Olson Timezone Identifier string.
MongoDB 3.6 added timezone parameter to the date manipulation operators. See Kevin's answer.
We can add the "timestamp" to 7 * 60 * 60 * 1000 in a $project stage.
The following pipeline seems to work in MongoDB 3.4 or older.
db.collection.aggregate([ { "$project": { "year": { "$year": { "$add": [ "$timestamp", 7 * 60 * 60 * 1000 ] } }, "month": { "$month": { "$add": [ "$timestamp", 7 * 60 * 60 * 1000 ] } }, "day": { "$dayOfMonth": { "$add": [ "$timestamp", 7 * 60 * 60 * 1000 ] } } } }])
Hi sharing my solution used on one of my extracts using mongodb version 3.4 or below and need it to covert from utc to manila time +08:00
see the sample query below
db.collection.aggregate([{$project:{ "created_at":{"$dateToString": { "date":{ "$add": [ "$yourtimestampfield", 8 * 60 * 60 * 1000 ] }, "format": "%Y-%m-%d %H:%M:%S"}},}}])