When will the stock market time change?

Does anyone know when will the stock market timing be changed from 9.15 AM to 5 PM?

It will 99% not happen in Cash market.
Extension was suggested by Sebi recently within a context

“If due to any technical reason or otherwise, continuous trading on stock exchanges is disrupted, it is of paramount importance that not only all market participants including other MIIs are promptly informed about the outage but also the trading hours are extended, if required, so as to provide an opportunity for smooth closure of intraday positions” , Sebi said

Derivatives (Futures) timings will in all likelihood be extended in the coming months.

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for interest rate derivatives to 5 pm IST (1100 GMT), effective Feb. 23,

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What are interest rate derivatives? Does it mean F&O and Options?

Yes. Explained here:

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