how to convert timestamp to date in mongodb?

Question

i am working on aggregation of mongodb collection.my mongodb collection has creation_time in timestamp.How will i can collect same day result and aggregate with next day res

Answer 1

In my case , I used

db.collection.aggregate([
  { "$project": {
    "date": { "$toDate": { 
        $multiply:["$_id",1000 ]
             } 
       }
  }}
])

convert timestamp from milliseconds to seconds.