How to create new object for a new date in mongodb?

I want to change the value of a variable named count in mongodb. Count is needed for every day.

For example, if count changes from 15 to 17 in one day, i want to update the existing object. Again start the next day with 0 and keep track of it.

This way I will have 365 objects(in a year) for a user which has the count value for each day.

How to do it in mongodb? or is relational db more suitable for this?

Create an array of objects (counters) in the document and save the counter in a specific object.