Extract Month and Year From Date in R

Question

I have tried a number of methods to no avail. I have data in terms of a date (YYYY-MM-DD) and am trying to get in terms of just the month and year, such as: MM-YYYY or YYYY-

Answer 1

Use substring?

d = "2004-02-06"
substr(d,0,7)
>"2004-02"