One Question about Weekly option close price.

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How to get NIFTY closing estimate?

NIFTY closing number is based on 30 minute average of NIFTY before closing. i.e. from 3:00 PM to 3:30 PM. I have tried Weighted Moving Average with different lengths. If I choose a length that gives closes match for a particular day’s closing, that same length does not work on other days. So my question is: What is the most definitive way to obtain the NIFTY average value using the same formula that is used by NSE? PS: I have already seen NSE documents. They simply say it is a weighted average…