Mongodb aggregate: convert date to another timezone

Question

I save my transaction with something like :

{code: \"A\", total: 250000, timestamp: ISODate(\"2016-01-20T23:57:05.771Z\")},
{code: \"B\", total: 300000, time         


        

Answer 1

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 ] } } 
    } }
])