base (version 3.4.0)

weekdays: Extract Parts of a POSIXt or Date Object

Description

Extract the weekday, month or quarter, or the Julian time (days since some origin). These are generic functions: the methods for the internal date-time classes are documented here.

Usage

weekdays(x, abbreviate)
# S3 method for POSIXt
weekdays(x, abbreviate = FALSE)
# S3 method for Date
weekdays(x, abbreviate = FALSE)
months(x, abbreviate)
# S3 method for POSIXt
months(x, abbreviate = FALSE)
# S3 method for Date
months(x, abbreviate = FALSE)
quarters(x, abbreviate)
# S3 method for POSIXt
quarters(x, …)
# S3 method for Date
quarters(x, …)
julian(x, …)
# S3 method for POSIXt
julian(x, origin = as.POSIXct("1970-01-01", tz = "GMT"), …)
# S3 method for Date
julian(x, origin = as.Date("1970-01-01"), …)

Arguments

x

an object inheriting from class "POSIXt" or "Date".

abbreviate

logical vector (possibly recycled). Should the names be abbreviated?

origin

an length-one object inheriting from class "POSIXt" or "Date".

…

arguments for other methods.

Value

weekdays and months return a character vector of names in the locale in use. quarters returns a character vector of "Q1" to "Q4". julian returns the number of days (possibly fractional) since the origin, with the origin as a "origin" attribute. All time calculations in R are done ignoring leap-seconds.

See Also

DateTimeClasses, Date