Converting yearmon column to last date of the month in R

Question

I have a data frame (df) like the following:

Date        Arrivals

2014-07      100
2014-08      150
2014-09      200

I know that I can con

Answer 1

Using lubridate, you can add a month and subtract a day to get the last day of the month:

library(lubridate)

ymd(paste0(df$Date, '-01')) + months(1) - days(1)
# [1] "2014-07-31" "2014-08-31" "2014-09-30"