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Why is MongoDB timestamp is disabled?

That's because you really don't want to use timestamp which is a MongoDB-internal data type: https://docs.mongodb.com/manual/reference/bson-types/#timestamps

 

You want to use date which is really an ISODate data type https://docs.mongodb.com/manual/reference/method/Date/ or alternatively use string with a format date-time, ideally formatted according to ISO 8601.

 

We do display the timestamp data type for backward compatibility purposes, but disabled it so users would not be tempted to use it.