In India, labor laws related to weekly offs and holidays during leave periods differ according to the type of employment, the nature of the organization, and the relevant state laws. In your case, being in Guwahati, Assam, the applicable law would be the Assam Shops and Establishments Act, 1971, if your organization falls under that category.
According to the Factory Act 1948, if an employee is on leave, and a weekly off or a declared holiday falls within the leave period, such weekly off or holiday is generally not counted as leave. This means if an employee takes 20 days leave, and during this period, if weekly offs or declared holidays occur, they will not be counted as part of the leave. So, in a practical scenario, if an employee takes leave from Monday to the following 3rd Friday (20 days), and if Sunday is the weekly off, then the total leave count would be 15 (not counting the Sundays in between).
However, this can vary according to the leave policy of each organization and the relevant state-specific labor laws. Therefore, please review your company's leave policy and if needed, consult your HR department for further clarification.
Remember, this is a general interpretation based on common labor laws in India and might not be applicable in certain cases. Always refer to the specific labor law applicable to your region and your organization's internal policies for accurate information.