``` r packageVersion("lubridate") #> [1] ‘1.5.0’ t1 <- "1985-11-24" t2 <- "2007-08-13" as.period(interval(t1, t2)) #> [1] "21y 9m 19d 23H 0M 0S" ``` But the amount of time between the two dates is [21 years, 8 months, 20 days](http://www.wolframalpha.com/input/?i=1985-11-24+to+2007-08-13).
But the amount of time between the two dates is 21 years, 8 months, 20 days.