Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{"_id":"5aa2d0f9e10fed2054fe1138","title":"Hello World","date":"2018-03-09T03:00:00.000Z"}]
Query
db.collection.aggregate([{$addFields:{"month":{$month:"$date"}}},{$match:{month:3}}])
Result