Accenture is a good company. Discuss with your present company when they will relieve you and accordingly you can convey your last working day to Accenture. They will confirm you their date of joining.
I hope, there is nothing to worry.
Wish you all the best.
29th September 2015 From India, Panipat
Yes--it's OK if the confirmation is over email.
And not sure what you mean by 'they would revise my offer letter'. There's NO revision of the Offer letter involved--except the clarity on the Date of Joining.
And even if this happens over phone, you can always back to mail to them reconfirming the Date as per discussion.....thus ensuring it is put in-writing.
All the Best.
1st October 2015 From India, Hyderabad
So please decide fast as validity of offer is for 7 days as mentioned by you. I quote below from your offer as mentioned above and find a gesture of goodwill from the company in the words 'mutually agreed date of joining'
V K Gupta
1st October 2015 From India, Panipat