day: Get/set days component of a date-time

In lubridate: Make Dealing with Dates a Little Easier

Description

Get/set days component of a date-time

Usage

day(x)

mday(x)

wday(
  x,
  label = FALSE,
  abbr = TRUE,
  week_start = getOption("lubridate.week.start", 7),
  locale = Sys.getlocale("LC_TIME")
)

qday(x)

yday(x)

day(x) <- value

mday(x) <- value

qday(x) <- value

wday(x, week_start = getOption("lubridate.week.start", 7)) <- value

yday(x) <- value

Arguments

x	a POSIXct, POSIXlt, Date, chron, yearmon, yearqtr, zoo, zooreg, timeDate, xts, its, ti, jul, timeSeries, or fts object.
label	logical. Only available for wday. TRUE will display the day of the week as an ordered factor of character strings, such as "Sunday." FALSE will display the day of the week as a number.
abbr	logical. Only available for wday. FALSE will display the day of the week as an ordered factor of character strings, such as "Sunday." TRUE will display an abbreviated version of the label, such as "Sun". abbr is disregarded if label = FALSE.
week_start	day on which week starts following ISO conventions - 1 means Monday, 7 means Sunday (default). When label = TRUE, this will be the first level of the returned factor. You can set lubridate.week.start option to control this parameter globally.
locale	locale to use for day names. Default to current locale.
value	a numeric object

Details

mday() and yday() return the day of the month and day of the year respectively. day() and day<-() are aliases for mday() and mday<-().

Value

wday() returns the day of the week as a decimal number or an ordered factor if label is TRUE.

Examples

x <- as.Date("2009-09-02")
wday(x) #4

wday(ymd(080101))
wday(ymd(080101), label = TRUE, abbr = FALSE)
wday(ymd(080101), label = TRUE, abbr = TRUE)
wday(ymd(080101) + days(-2:4), label = TRUE, abbr = TRUE)

x <- as.Date("2009-09-02")
yday(x) #245
mday(x) #2
yday(x) <- 1  #"2009-01-01"
yday(x) <- 366 #"2010-01-01"
mday(x) > 3

Example output

Attaching package: 'lubridate'

The following object is masked from 'package:base':

    date

[1] 4
[1] 3
[1] Tuesday
7 Levels: Sunday < Monday < Tuesday < Wednesday < Thursday < ... < Saturday
[1] Tues
Levels: Sun < Mon < Tues < Wed < Thurs < Fri < Sat
[1] Sun   Mon   Tues  Wed   Thurs Fri   Sat  
Levels: Sun < Mon < Tues < Wed < Thurs < Fri < Sat
[1] 245
[1] 2
[1] FALSE

lubridate documentation built on Oct. 7, 2021, 5:07 p.m.