Convert day of year to date

Question

How do I convert day-of-year to date? For example, what's the date for 104th day of 2004?

This is the opposite of How do you convert POSIX date to day of year in R?

Answer 1

I found that @TMS answer ignores the year specified in the origin, replacing it with the actual year you are executing the command (as @Shekeine found). Doing this seems to work fine though:

as.Date(104, origin = "2014-01-01")

CAUTION: day-of-year is zero based in this case!

Answer 2

This is the way I do it:

as.Date(104, format = "%j", origin = "1.1.2014")
# "2014-04-15"

PS: for those who wonder if answering my own question is encouraged, please look here: https://meta.stackexchange.com/questions/17463/can-i-answer-my-own-questions-even-if-i-knew-the-answer-before-asking

Answer 3

as.Date(2, origin = '2014-01-01')

As for the issue with above code giving the output as 2014-01-03 .

You can just put the origin as the last day of the previous year.

as.Date(2, origin = '2013-12-31')

It works that way.