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28*13(+1)=365 (or +2 on leap years)

1 second = 9192631770 unperturbed ground-state hyperfine transitions of cesium-133 atom (preferably outside of solar system gravitation well)

Calendars are silly. "Neat" ones even more so.

Nah, humans are just missing about a twelfth of a finger.

Brb, just going to check my pocket cesium-133 so I can calculate how many days till my dentist appointment.