What is the best way to store dates of birth in MongoDB?

Question

I've read a lot about how to store simple dates (without time) in MongoDB, but I still can't find an answer. Some say to store theme like MongoDate (date + utc time), some say to store theme like a YYYYMMDD string, and some like other funny ways. The rightest way seems to be MongoDate, but why should I store a date of birth as a date with UTC time?

Plus, the date of birth "1990-05-21" is stored as "1990-05-20T23:00:00Z" (the day before): this date shouldn't change depending on timezone, but remain the same world wide.

I'm still wondering why MongoDB doesn't provide a simple "date" type, as all the other databases do.

Answer 1

Store it as a simple string "1985-21-07". It might sound counter-intuitive and light up your red "database types" bulb, but saving a date of birth as a Date() brings to the table many "parts" (hours, minutes, seconds...) that don't mean anything and will cause headache and be error-prone when saving and getting birth dates in and out of mongo.

Read the highest answer here (NOT THE ONE MARKED AS CORRECT): What is the best way to store dates in MongoDB?