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 epidemiological week calendars.
year(x)year(x) <- valueisoyear(x)epiyear(x)
year(x) <- value
the years element of x as a decimal number
a date-time object
a numeric object
year does not yet support years before 0 C.E.
x <- ymd("2012-03-26")
year(x) <- 2001
year(x) > 1995
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