That is the production date, not the activation date. The activation date you should be able to see with DJI Assistant in the logs of Mavic Air when it was flown first.
Thank you I figured that out however I bought a Dji mavic air from a authorised dealer listed on the Dji website but he advised it was not a sealed pack so managed to get the S/N image on the drone from him and was curious to know if it had been activated before so needed help with finding out is there a way
I found that the easiest way to figure this out is to chat up support. It took him about 2 minutes to tell me if the SN had ever been activated before.