New set of articles as per ca 2013

Change of name, Object Clause and adoption of new set of Articles:

Hello Sir,

Is it mandatory to every company to alter its AOA pursuant to New Companies Act, 2013?

Please accord your valuable suggestions..

No,  it is not mandatory [Ref. Sec.5(9)].  However, it is advisable to alter the Articles for various reasons. 

Thanks a lot sir...

from which date it is compulsory for companies ???????????