DX DAY refers to the time period from today's 20 UTC to next day's 20 UTC. This means that exactly at 20 UTC, JAGUAR will create a new folder ("day folder") onto the hard disk used for recordings, and all the recordings created after 20 UTC will be saved into this folder. 20 UTC has been selected, instead of 00 UTC, because this way in Europe, we can save all the overnight recordings into the same folder. DX DAY also serves as a breakpoint for all-day-running JAGUAR services, including YASLOG and SCANS.
The DX DAY functionality is controlled and handled automatically by JAGUAR; you just have to be aware of the time when the new DX DAY starts.