How do I calculate age as years, months, and days in R?

Question

I want to calculate age as years, months, and days.

I can do it with python's dateutil package

from dateutil.relativedelta import relativedelta
from datetime import date
rel_obj = relativedelta(date(2008,8,6),date(2004,1,1))
rel_obj.years, rel_obj.months, rel_obj.days

(4, 7, 5)

I used difftime function in R

o <- difftime(date("2008-8-6") , date("2004-1-1"))
o$ : has no attribute like relativedelta's

How do I format difftime object like in python?

Answer 1

Here is a solution with package lubridate , a standard R package to deal with dates and times.

library(lubridate)
#> Loading required package: timechange
#> 
#> Attaching package: 'lubridate'
#> The following objects are masked from 'package:base':
#> 
#>     date, intersect, setdiff, union

d1 <- as.Date("2004-1-1")
d2 <- as.Date("2008-8-6")

diffdays2ymd <- function(x, y, ...) {
  tmp <- x |>
    lubridate::interval(y) |> 
    lubridate::as.period()
  y <- lubridate::year(tmp)
  m <- lubridate::month(tmp)
  d <- lubridate::day(tmp)
  c(year = y, month = m, day = d)
}
diffdays2ymd(d1, d2)
#>  year month   day 
#>     4     7     5

^{Created on 2022-12-13 with reprex v2.0.2}