If you are working in the IT company then please refer Shops and Establishment Act of your state.
Under the provisions of this act, after six days of work, employee is eligible to get weekly off on the seventh day. This weekly off is a paid one. You cannot consider weekly off as absence and start deducting the salary.
From India, Bangalore
For Employees engaged on Monthly Salary, you have to include Weekl Off as already stated by Mr Dinesh
You will be governed by applicable Shops & Commercial Establishments Act
From India, New Delhi