to show month and year only

i have a table in the column , i want it to show month and year only
like this: 06/24
06 being the month, and 24 being the year
but it shows as 62/4 or 624
and for october, november and december ..when we enter data, we enter it with 4 digits number, but for the rest of the month, we just enter 3 digits ..being only month and year
please see attachment, thanks in advance.