How to get a date from day of year

Question

I am working with a data set that looks a bit like this:

    Year Date       Day_nr Value
    1976 19-02-1976 50     167
    1976 19-03-1976 79     140
    1         


        

Answer 1

Google appears to have an answer: https://stat.ethz.ch/pipermail/r-help/2012-March/308013.html

Using first line from second set above as an example:

> strptime(paste("1976", 53), format="%Y %j")
[1] "1976-02-22"