# weekdays

0th

Percentile

##### Extract Parts of a POSIXt or Date Object

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.

Keywords
chron
##### 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.

##### 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. Alternatively (especially if the components are desired as character strings), use strftime.

DateTimeClasses, Date

##### Aliases
• weekdays
• weekdays.POSIXt
• weekdays.Date
• months
• months.POSIXt
• months.Date
• quarters
• quarters.POSIXt
• quarters.Date
• julian
• julian.POSIXt
• julian.Date
##### Examples
library(base) # NOT RUN { weekdays(.leap.seconds) months(.leap.seconds) quarters(.leap.seconds) ## Julian Day Number (JDN, https://en.wikipedia.org/wiki/Julian_day) ## is the number of days since noon UTC on the first day of 4317 BC. ## in the proleptic Julian calendar. To more recently, in ## 'Terrestrial Time' which differs from UTC by a few seconds ## See https://en.wikipedia.org/wiki/Terrestrial_Time julian(Sys.Date(), -2440588) # from a day floor(as.numeric(julian(Sys.time())) + 2440587.5) # from a date-time # } 
Documentation reproduced from package base, version 3.6.1, License: Part of R 3.6.1

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