| weekdays {base} | R Documentation |
Extract Parts of a POSIXt 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
## S3 method for class 'POSIXt'
weekdays(x, abbreviate = FALSE)
## S3 method for class 'POSIXt'
months(x, abbreviate = FALSE)
## S3 method for class 'POSIXt'
quarters(x, ...)
## S3 method for class 'POSIXt'
julian(x, origin = as.POSIXct("1970-01-01", tz="GMT"), ...)
Arguments
x |
an object inheriting from class |
abbreviate |
logical. Should the names be abbreviated? |
origin |
an length-one object inheriting from class |
... |
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.
Note
Other components such as the day of the month or the year are
very easy to compute: just use as.POSIXlt and extract the
relevant component.
See Also
DateTimeClasses
Examples
weekdays(.leap.seconds)
months(.leap.seconds)
quarters(.leap.seconds)