Convert integer as “20160119” to different columns of “day” “year” “month”

Question

How can I convert a column of integers as dates:

       DATE PRCP
1: 19490101   25
2: 19490102    5
3: 19490118   18
4: 19490119  386
5: 19490202   38
         


        

Answer 1

I would advise you to use the lubridate package:

require(lubridate)
df[, DATE := ymd(DATE)]
df[, c("Day", "Month", "Year") := list(day(DATE), month(DATE), year(DATE))]
df[, DATE := NULL]