basically in 1793 after the louis and marie were annihilated they destroyed everything old french over time (yes even the calendar) and so they made this thing up and kept going with it for 13 years until napoleon eradicated it because it was difficult and he wanted to be friends with the churches
joseph desire court this thing is on UTC, for any pacific guys add or subtract 0.3333333333 for accurate time depends where you are i guess idk about anywhere else