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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.

Usage

year(x)

year(x) <- value

isoyear(x)

epiyear(x)

Arguments

x

a date-time object

value

a numeric object

Value

the years element of x as a decimal number

Details

year does not yet support years before 0 C.E.

Examples

x <- ymd("2012-03-26")
year(x)
#> [1] 2012
year(x) <- 2001
year(x) > 1995
#> [1] TRUE