Sources
Where each time comes from
NSE documents only; quotations are verbatim.
Documents
- NSE product page: Closing Auction Session (CAS). Read 2026-10-12.
- NSE FAQ: FAQs on Pre-open Session in Equity (CM) Segment, Version 1.0, July 2026 (applicable w.e.f. September 07, 2026). Read 2026-10-12.
- NSE FAQ: FAQ on Pre-open Session in Equity Derivatives (F&O) Segment, Version 2.0, July 2026 (applicable w.e.f. September 07, 2026). Read 2026-10-12.
- NSE circular: NSE/CMTR/75479, 30 July 2026: Go Live of trading modalities related to Introduction of Closing Auction Session (CAS) in Equity Cash segment. Read 2026-10-12.
- NSE circular: NSE/CMTR/73362, 18 March 2026: Operational guidelines and SOP on Introduction of Closing Auction Session (CAS) in the Equity Cash Segment. Read 2026-10-12.
- NSE circular: NSE/CMTR/76170, 3 September 2026: Operational guidelines and SOP on CAS – Update. Read 2026-10-12.
- NSE circular: NSE/FAOP/76186, 4 September 2026: Go Live of modification in the pre-open call auction framework. Read 2026-10-12.
- NSE page: Market Timings. Read 2026-10-12.
Method
Every quotation and table cell was checked by script against the downloaded document. Times on the dial and rail are taken from those quotations. The worked auctions use an invented stock and invented orders, computed by this site’s code with the three tests NSE states.
Not covered
Settlement cycles, holidays, block deal windows, special pre-open sessions for IPOs, price bands outside the closing auction, and any proposal not yet in an NSE circular.