I know we are dominated by Metric and us lone Yanks still use the US Customary units.
But imagine all the aliens that are part of the UFP that have their own units of measurement / time measurement units.
That's got to be a pain in the conversion arse with so many Member species.
In my Head Cannon for a New Star Trek TV series, Metric Units has become UFP standard, but for StarDate, we couldn't get exactly everything we wanted, so the StarDate system was based on the Gregorian Calender, but converted into Metric Time and that was part of the big compromise while StarFleet used Earth's 24 hr clock cycle for Ship Wide operations.
But imagine all the aliens that are part of the UFP that have their own units of measurement / time measurement units.
That's got to be a pain in the conversion arse with so many Member species.
In my Head Cannon for a New Star Trek TV series, Metric Units has become UFP standard, but for StarDate, we couldn't get exactly everything we wanted, so the StarDate system was based on the Gregorian Calender, but converted into Metric Time and that was part of the big compromise while StarFleet used Earth's 24 hr clock cycle for Ship Wide operations.