Converting dates before January 1, 1970 in R

Question

I am trying to convert a column of dates into Date objects in R, but I can\'t seem to get the desired results. These individuals have birth dates before January 1, 1970, so when

Answer 1

I would do:

library(lubridate)

x <- as.Date("1/12/54", format = "%m/%d/%y")
year(x) <- 1900 + year(x) %% 100

> x
[1] "1954-01-12"