Prank pulled by our physics teacher in Freshman year of high school.

The metric system unit of measurement.
1 Fec = 31557.8 seconds
1 Fec= 8.76 Hours
1 Fec = 0.365 days
The metric hour is deciFec (dF) = 0.1 Fecs
The metric minute is milliFec (mF) = 0.001 Fecs
The metric second is microFec (µF) = 0.000001 Fecs
The metric Week is DecaFec (DF) = 10F
The metric metric month is hectoFec (hF) 100F

The metric year is KiloFec (KF) = 1000 Fecs or 365.25 days.
The metric Century is MegaFec (MF) = 1000000 Fecs
The Fec systems eliminates the problem of Leap-years and also adopts a base 10 unit of time, like every other measurement. The system will be adopted in 50 years, after all old people who didn’t learn the Fec system in school die.