Group result by 15 minutes time interval in MongoDb

Question

I have a \"status\" collection like this strcture -

{
    _id: ObjectId(\"545a0b63b03dbcd1238b4567\"),
    status: 1004,
    comment: \"Rem dolor ipsam place         


        

Answer 1

Another useful way:

db.collection.aggregate([
  {$group: {
    _id: { 
      overallTime: { 
        $dateToString: { format: "%Y-%m-%dT%H", date: "$created_at" } 
      },
      interval: { $trunc: { $divide: [{ $minute: "$created_at" }, 15 ]}}
    },
  }},
])

And more easier for min, hour, day intervals:

var format = "%Y-%m-%dT%H:%M"; // 1 min
var format = "%Y-%m-%dT%H"; // 1 hour
var format = "%Y-%m-%d"; // 1 day

db.collection.aggregate([
  {$group: {
    _id: { $dateToString: { format: format, date: "$created_at" } },
  }},
])