I'm clear on how to query documents within a range, but if I want, say, all docs in a collection created at 3PM (assuming I have a field with that stored of course - lets call it createdAt), what would that query look like? At present these dates are stored in my collection as JavasSript Date objects.

CodePudding user response：

You can do it like this:

db.collection.aggregate([
  {
    "$match": {
      "$expr": {
        "$eq": [
          {
            "$hour": "$createdAt"
          },
          15
        ]
      }
    }
  }
])

Working example