Date formatting MMM-YYYY

Question

I have a dataset with dates in following format:

Initial:

Jan-2015 Apr-2013 Jun-2014 Jan-2015 Jan-2016 Jan-2015 Jan-2016 Jan-2015 Apr-2012 Nov-2012 Jun-2         


        

Answer 1

You could use as.yearmon from the zoo package for this.

library(zoo)
12 * (as.yearmon("Jan-2015", "%b-%Y") - as.yearmon("Feb-2014", "%b-%Y"))

# result
# [1] 11