Dates {base}R Documentation

Date Class

Description

Description of the class "Date" representing calendar dates.

Details

Dates are represented as the number of days since 1970-01-01, with negative values for earlier dates. They are always printed following the rules of the current Gregorian calendar, even though that calendar was not in use long ago (it was adopted in 1752 in Great Britain and its colonies).

It is intended that the date should be an integer, but this is not enforced in the internal representation. Fractional days will be ignored when printing. It is possible to produce fractional days via the mean method or by adding or subtracting an object of class "difftime".

See Also

Sys.Date for the current date.

format.Date for conversion to and from character strings.

plot.Date and hist.Date for plotting.

weekdays for convenience extraction functions.

seq.Date, cut.Date, round.Date for utility operations.

DateTimeClasses for date-time classes.

Examples

(today <- Sys.Date())
format(today, "%d %b %Y")  # with month as a word
(tenweeks <- seq(today, len=10, by="1 week")) # next ten weeks
weekdays(today)
months(tenweeks)
as.Date(.leap.seconds)

[Package base version 2.1.0 Index]