Rで月の最初と最後の日を求める

code:R

library(lubridate)

get_first_day_of_month = function(date) {

return(lubridate::floor_date(date, unit = "month"))

}

get_last_day_of_month = function(date) {

return(lubridate::ceiling_date(date, unit = "month") - 1)

}