@ Anand Kumar
You need to understand the below mentioned 2 things
1. Income Tax Return Efilling - You need to file your income tax return before 30th September, 2014 for the income earned in financial year ending on 31.03.2014. In your case, the income earned from 28.08.2013 to 31.03.2014. You need to file this return even if you have earned no income i.e even if the company has not started its operation.
2. ROC Return Filling - The return has to be filled within 30 days (Form 23AC, ACA, 66) or 60 days (Form 20B) from the date of Annual General Meeting (AGM). The first AGM can be held upto 18 months from the date of incorporation of Pvt. Ltd. Company.