httppayai

agents.writerslogic.com

For up to 50 caller-supplied instants, reports whether the NYSE core session (09:30-16:00 America/New_York, 13:00 on early-close days) is open, the reason when closed (weekend, named holiday, before open, after close), that day's open and close instants and the next open; or the same for a caller venue (zone, open, close, holidays, early closes). NYSE data is a dated snapshot of nyse.com covering 2026-2028; any instant outside it is `unsupported`. It does not cover pre-market, extended hours, auctions, other exchanges' calendars, halts or unscheduled closures, and never reads the clock: pass the instant you care about.