How to convert dd/mm/yy to yyyy-mm-dd in R

Question

I have a vector with dates values in this format dd/mm/yy e.g.(27/06/16). I want to convert this in this format yyyy-mm-dd e.g.(2016-06-27) for logical comparison. I am usin

Answer 1

One option would be to convert both date formats into a common POSIX representation:

d1 <- strptime("27/06/16", "%d/%m/%y")
d2 <- strptime("2016-06-27", "%Y-%m-%d")

Since both d1 and d2 should be of the same R class, you can then just compare them as you wish.