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.
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"), …)
an object inheriting from class "POSIXt" or "Date".
logical vector (possibly recycled). Should the names be abbreviated?
an length-one object inheriting from class
"POSIXt" or "Date".
arguments for other methods.
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.