Delhi (New Delhi) operates on IST — Indian Standard Time (UTC +5:30), the same timezone used across all of India. India's single national timezone — a deliberate political choice made at independence — means Delhi, Mumbai, Kolkata, and Chennai all share IST regardless of their geographic longitude. India does not observe daylight saving time, so IST remains at UTC +5:30 every day of the year.
Delhi is India's capital and the seat of its federal government, making IST relevant for policy announcements, parliamentary schedules, and regulatory filings from institutions including the Reserve Bank of India (RBI), SEBI (Securities and Exchange Board of India), and the Ministry of Finance. The RBI's monetary policy decisions and market interventions are announced in IST and closely watched by traders in London, New York, and Singapore.
Delhi's position as India's political centre differs from Mumbai's financial focus, but the two cities are closely linked — Delhi's government decisions are immediately priced into Mumbai's markets. A 10:00 AM Delhi press conference falls during active trading hours on both BSE and NSE (9:15 AM – 3:30 PM IST).
Scheduling with Delhi from global hubs: London (GMT) is 5 hours 30 minutes behind IST, so Delhi's business morning (9:30 AM – 12:00 PM IST) aligns with London's early hours (4:00–6:30 AM GMT) — typically before London offices open. The practical overlap window is 12:30–5:30 PM IST (7:00 AM–12:00 PM GMT). From the US East Coast, Delhi is 10.5–11.5 hours ahead — making same-day live collaboration essentially impossible without one party accepting an early morning or late-night call.