* meters
* kg
* lean celsius but don't care too much either way
* abolish seasonal time changes
* for online calls/events specify time in UTC
* YYYY-MM-DD date format
* ground floor is 0th; don't skip 4 and 13
* don't put sugar in cold tea

Simple rules for a civilized society.

method for time: 
one Planck sec - time it takes light to travel 1 Planck len. prefix to scale.

make months moons again. year and seasons start at the precise time when the earth is closest and furthest from the sun.

each planet, star, and Galaxy has a formula for intersystem calculation (travel derivatives etc)