title: Creating a new column for date info with specific date format
body: <p>Dear All I am working with a file which has few years data and I am trying to create an aditional coloumn that reads the year and month info from the date coloumn (e.g. 01/01/1997 12:00) and create a new coloumn with month and year together(e.g. Jan-97).</p>
  
  <p>I am not sure how to proceed with this but what I am trying to code is the coloumn with name "new_date" in the following picture:</p>
  
  <p><img src="https://i.stack.imgur.com/gRKbE.png" alt="enter image description here"></p>
  
  <p>My sample data:</p>
  
  <pre><code>Data &lt;-
  structure(list(date = structure(c(1L, 4L, 7L, 2L, 5L, 8L, 3L, 
  6L, 9L), .Label = c("01/01/1997 12:00", "01/01/1998 15:00", "01/01/1999 18:00", 
  "01/02/1997 13:00", "01/02/1998 16:00", "01/02/1999 19:00", "01/03/1997 14:00", 
  "01/03/1998 17:00", "01/03/1999 19:00"), class = "factor"), value = c(29L, 
  31L, 42L, 42L, 52L, 61L, 57L, 55L, 56L)), .Names = c("date", 
  "value"), row.names = c(NA, -9L), class = "data.frame")
  </code></pre>
  
  <p>I would really appreciate if you could advise me about how should I proceed with this.</p>