Date-time must be a POSIXct, POSIXlt, Date, Period or any other object convertible to POSIXlt.
isoyear() returns years according to the ISO 8601 week calendar.
epiyear() returns years according to the epidemilogical week calendars.
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a date-time object
a numeric object
year does not yet support years before 0 C.E.
the years element of x as a decimal number
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