Nothing
days <- function(date=NULL) {
if ( !(class(date)[1] %in% c("Date","POSIXct","POSIXlt")) )
stop("Only Date, POSIXct and POSIXlt class dates")
UseMethod("days")
}
days.Date <- function(date) {
as.numeric(format(date, "%d"))
}
days.POSIXct <- function(date) {
as.numeric(format(date, "%d"))
}
days.POSIXlt <- function(date) {
date$mday
}
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