GHY is probably https://www.goonhilly.org/ https://www.goonhilly.org/ So, likely the current time at the location of the radio antennas they're using to commun

GHY is probably https://www.goonhilly.org/ https://www.goonhilly.org/ So, likely the current time at the location of the radio antennas they're using to communicate with the lander.