Get/set months component of a date-time

Source: R/accessors-month.r

Date-time must be a POSIXct, POSIXlt, Date, Period, chron, yearmon, yearqtr, zoo, zooreg, timeDate, xts, its, ti, jul, timeSeries, and fts objects.

month(x, label = FALSE, abbr = TRUE, locale = Sys.getlocale("LC_TIME"))

month(x) <- value

Arguments

x

a date-time object
label

logical. TRUE will display the month as a character string such as "January." FALSE will display the month as a number.
abbr

logical. FALSE will display the month as a character string label, such as "January". TRUE will display an abbreviated version of the label, such as "Jan". abbr is disregarded if label = FALSE.
locale

for month, locale to use for month names. Default to current locale.
value

a numeric object

Value

If label = FALSE: month as number (1-12, 1 = January, 12 = December), otherwise as an ordered factor.

Examples

x <- ymd("2012-03-26")
month(x)
#> [1] 3
month(x) <- 1
month(x) <- 13
month(x) > 3
#> [1] FALSE

month(ymd(080101))
#> [1] 1
month(ymd(080101), label = TRUE)
#> [1] Jan
#> 12 Levels: Jan < Feb < Mar < Apr < May < Jun < Jul < Aug < Sep < ... < Dec
month(ymd(080101), label = TRUE, abbr = FALSE)
#> [1] January
#> 12 Levels: January < February < March < April < May < June < ... < December
month(ymd(080101) + months(0:11), label = TRUE)
#>  [1] Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
#> 12 Levels: Jan < Feb < Mar < Apr < May < Jun < Jul < Aug < Sep < ... < Dec