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Time is one of the units that hasn't been fully converted to metric, and probably never will be.

Because all time (on earth) is based on natural phenomenon on earth, then it is unlikely that the basic periods of a day, and a year would ever be replaced, and other units (seconds, minutes, hours) would be difficult to change.

Standard units are:

picoseconds

nanoseconds

milliseconds

seconds

minutes

hours

days

years

decades

centuries

millennia

Non standard units might be:

score (20 years)

An Age (if divided equally) is 2,160 years.

A Platonic Year - 25,920 years (time for the procession of the equinoxes)

Also note, there are several different types of years:

The vernal equinox tropical year of about 365.2424 years (varying over the centuries) is used for the Gregorian Calendar.

The mean tropical year of 365.24219 days.

A Sidereal year is 365.256363004 days

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