We have below collection named student, there is no field for creation time of document. But we have to find out creation timestamp of all documents.
Collection Name: students
[
{X
_id: ObjectId('6626fb9e6548c947e716c9b7'),
name: 'Joe Rogan',
age: 35,
country: 'USA'
},
{
_id: ObjectId('6626fe516548c947e716c9b9'),
name: 'Chris Williamson',
age: 35.4,
country: 'Austrelia'
},
{
_id: ObjectId('6626fe666548c947e716c9ba'),
name: 'Lex',
age: '28',
country: 'USA'
}
]
To learn more about ObjectId see : All about ObjectId in MongoDB.
db.students.find({},{}).forEach(doc=>print("name : "+doc.name+" createdTime : "+doc._id.getTimestamp()))