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Date-time must be a POSIXct, POSIXlt, Date, Period, chron, yearmon, yearqtr, zoo, zooreg, timeDate, xts, its, ti, jul, timeSeries, and fts objects.
year(x)year(x) <- valueisoyear(x)
year(x) <- value
isoyear(x)
a date-time object
a numeric object
the years element of x as a decimal number
year does not yet support years before 0 C.E.
# NOT RUN { x <- ymd("2012-03-26") year(x) year(x) <- 2001 year(x) > 1995 # }
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