How to generate Dynamicid

Question

I want Date wise dynamically generate  course ID
Example: 


 last week My Batch last Batch ID Table design 


Batchid        BatchName    BatchDate        Active 
BE/CSE199    CSE           13 oct 2014          A 


But I want This Week Start 15 oct 2014 automatically generate batch ID BE/CSE200 
Thanks..