New York City runs on the America/New_York timezone, alternating between EST (Eastern Standard Time, UTC −5:00) in winter and EDT (Eastern Daylight Time, UTC −4:00) from mid-March to early November. As the host of the New York Stock Exchange and NASDAQ — two of the world's largest equity markets by capitalisation — New York time is a reference point for financial professionals on every continent.
The NYSE and NASDAQ both operate 9:30 AM to 4:00 PM ET, Monday through Friday. Pre-market trading begins as early as 4:00 AM ET, and after-hours trading runs until 8:00 PM ET, giving investors in Europe and Asia limited windows to trade US equities during their own business days.
Scheduling with New York from different regions: London (GMT) is 5 hours ahead of New York during EST and 4 hours ahead during EDT — the gap shrinks by one hour during US/UK DST overlap. From Los Angeles, New York is 3 hours ahead, making 9:00 AM Pacific the equivalent of noon ET. From Mumbai (IST), New York is 10.5 hours behind in winter and 9.5 hours behind in summer, which means India's evening (8:30–10:30 PM IST) overlaps with New York's standard business morning. Teams in Singapore are 13 hours ahead of EDT, so their early morning (7:00–9:00 AM SGT) aligns with New York's previous evening.
New York observes daylight saving time following US federal rules: clocks spring forward one hour on the second Sunday in March at 2:00 AM local time and fall back on the first Sunday in November at 2:00 AM local time. This schedule typically differs from European DST changes by 2–3 weeks, temporarily altering the usual US–Europe time gap each spring and autumn.
The city spans five boroughs — Manhattan, Brooklyn, Queens, The Bronx, and Staten Island — all sharing a single timezone. Although New York State extends roughly 500 miles north to Canada, the entire state remains on EST/EDT, unlike a few US states (Indiana historically, Arizona today) that have opted for single-timezone operation without DST.