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