The market timings for a stock on its listing day are structured as follows:

• Exchange Call Auction in Pre-open Session (9:00 AM - 9:35 AM):
   During this period, investors can place, modify, or cancel orders for new IPOs or re-listed scrips. The exchange is open for order entry.
• Exchange Call Auction Order Collection End Time (9:35 AM - 9:45 AM):
   At any point during this time frame, the exchange will stop accepting modifications or cancellations for these orders.
• Order Matching and Confirmation Period (9:45 AM - 9:55 AM):
   The exchange stops accepting new orders or modifications, and the opening price is determined. This period is used for order matching and trade confirmation for the stock.
• Buffer Period (9:55 AM - 10:00 AM):
   This brief interval allows for a smooth transition from the pre-open call auction session to the continuous trading session.
• Continuous Trading Session (10:00 AM - 3:30 PM):
   Continuous trading begins for the IPO or re-listed stock. Unmatched orders from the call auction are carried over to this session, where they are matched at the opening price.

This phased approach allows for an organized process of order collection, matching, and continuous trading on the listing day.