Birthday Riddles

Year 1991: 

nearly 2 years and a little more from today, Susan's neighbour Lucy asked her what her age was on her(Susan's) last birthday? 

Susan replied that she was 12 year old.

"And how old would you be on your next birthday?"

Susan replied, "Aunty, if  i don't fail in any class i shall be completing 12+3 course  and would be studying for my Master degree on my next birthday."

Lucy was puzzled.

Could you tell the exact date, month and year on which Lucy had asked Susan the above question?