Get/set days component of a date-time

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

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 and 7 means Sunday (default). When label = FALSE and week_start = 7, the number returned for Sunday is 1, for Monday is 2, etc. When label = TRUE, the returned value is a factor with the first level being the week start (e.g. Sunday if week_start = 7). You can set lubridate.week.start option to control this parameter globally.
locale: locale to use for day names. Default to current locale.
value: (for wday<-) a numeric or a string giving the name of the day in the current locale or in English. Can be abbreviated. When a string, the value of week_start is ignored.

Value

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

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<-().

Examples

x <- as.Date("2009-09-02")
wday(x) # 4
#> [1] 4
wday(x, label = TRUE) # Wed
#> [1] Wed
#> Levels: Sun < Mon < Tue < Wed < Thu < Fri < Sat

wday(x, week_start = 1) # 3
#> [1] 3
wday(x, week_start = 7) # 4
#> [1] 4

wday(x, label = TRUE, week_start = 7) # Wed (Sun is the first level)
#> [1] Wed
#> Levels: Sun < Mon < Tue < Wed < Thu < Fri < Sat
wday(x, label = TRUE, week_start = 1) # Wed (Mon is the first level)
#> [1] Wed
#> Levels: Mon < Tue < Wed < Thu < Fri < Sat < Sun

wday(ymd(080101))
#> [1] 3
wday(ymd(080101), label = TRUE, abbr = FALSE)
#> [1] Tuesday
#> 7 Levels: Sunday < Monday < Tuesday < Wednesday < Thursday < ... < Saturday
wday(ymd(080101), label = TRUE, abbr = TRUE)
#> [1] Tue
#> Levels: Sun < Mon < Tue < Wed < Thu < Fri < Sat
wday(ymd(080101) + days(-2:4), label = TRUE, abbr = TRUE)
#> [1] Sun Mon Tue Wed Thu Fri Sat
#> Levels: Sun < Mon < Tue < Wed < Thu < Fri < Sat

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