Date Format

Hi Everyone,

               I have a line graph with month start date on X-axis. 

Month start date format = MM-YYYY (i.e. JAN2017 , FEB2017, MAR2017).

I want to change the format to MM-YY (ie JAN17, FEB17,MAR17 etc..) which is not available in the data formats list.

how can i get this format with correct sorting.

Thanks