Formula for 2023 stardates

Captain's log, stardate 78207.68

Just convert from decimal Unix time to decimal milliyears.

SD = 1000*(U/S/L + D)

U = Unix time in seconds S = Seconds in a day = 24x60x60 = 86400 sec L = Length of year = 365.25 days D = Difference between Unix and SD epochs = 1970 - 1945 = 25 years