The set_killdate command will configure a badger to exit on a given kill date irrespective of whether the badger is connected to the server or not. The get_killdate command on the other hand returns the current set killdate for the badger. It accepts a date format in the RFC822 format e.g.: 22 Sep 21 22:55 IST. This is basically a cleanup command for your payloads, so that the payload does not connect back to your C2 after the engagement completes.
The above figure shows the badger exiting exactly on the provided killdate and time.