r - Convert Julian date to calendar dates within a data frame

Question

I have a data frame

> df
Age   year  sex
12    80210  F
13     9123  M

I want to convert the year 80210 as 26june1982. How can I do this that the new data frame contains year in day month year formate from Julian days.

Answer 1

You can convert Julian dates to dates using as.Date and specifying the appropriate origin:

as.Date(8210, origin=as.Date("1960-01-01"))
#[1] "1982-06-24"

However, 80210 needs an origin pretty long ago.