Notice Period Calculation - from resign date or accepted date?

Dear All
As per Appointment order,My notice period is one month..i gave my resign letter on 24/07/2017 through mail and handwritten copy both..our management accepted on 05/08/2018..Now our HR Team says we accepted on 05/08/2017 only so you should work upto 05/09/2017..pls confirm which one is correct..my resign date or accepted date..

Hi Mohan,
This varies from one company to another. Should there be NO policy on how HR is accepting the resignation letters, my best suggestion is to just follow the HR. The approval may have been 2 weeks delayed but it is good to show that you are respecting HR's request. In this way both will have a peaceful separation. You may never know, if you plan to go back to them and since you have shown good attitude towards HR procedure, you might get a chance again.
On the other, if you are preparing in joining a new company, tell them honestly about the notice period. If they really want you they will wait for you.
Best of luck to your future endeavors!