Kolkata to Chicago Time
Live IST ↔ CST/CDT time converter · West Bengal, India → USA DST applies
24-Hour Overlap Timeline
⚠ Chicago observes daylight saving time — offset shifts between UTC-6 and UTC-5 seasonally
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UTC → | ||||||||||||||||||||||||
| 🇮🇳 Kolkata UTC+5:30 | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a |
| 🇺🇸 Chicago UTC-6 | 6p | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p |
IST (Indian Standard Time) to Chicago (CST (Central Standard Time)/CDT (Central Daylight Time)) Conversion Table
All 24 hours of the day · based on standard time — CST (Central Standard Time).
Live offset may differ during DST (CDT (Central Daylight Time)) — see clock above.
✅ Both in business hours 🔵 India office hours only 🟢 Chicago office hours only
| IST (Indian Standard Time) — Kolkata | Chicago — CST/CDT | Working hours |
|---|---|---|
| 12:00 AM IST (Indian Standard Time) | 12:30 PM CST | 🟢 CST only −1 day |
| 1:00 AM IST (Indian Standard Time) | 1:30 PM CST | 🟢 CST only −1 day |
| 2:00 AM IST (Indian Standard Time) | 2:30 PM CST | 🟢 CST only −1 day |
| 3:00 AM IST (Indian Standard Time) | 3:30 PM CST | 🟢 CST only −1 day |
| 4:00 AM IST (Indian Standard Time) | 4:30 PM CST | 🟢 CST only −1 day |
| 5:00 AM IST (Indian Standard Time) | 5:30 PM CST | −1 day |
| 6:00 AM IST (Indian Standard Time) | 6:30 PM CST | −1 day |
| 7:00 AM IST (Indian Standard Time) | 7:30 PM CST | −1 day |
| 8:00 AM IST (Indian Standard Time) | 8:30 PM CST | −1 day |
| 9:00 AM IST (Indian Standard Time) | 9:30 PM CST | 🔵 India only −1 day |
| 10:00 AM IST (Indian Standard Time) | 10:30 PM CST | 🔵 India only −1 day |
| 11:00 AM IST (Indian Standard Time) | 11:30 PM CST | 🔵 India only −1 day |
| 12:00 PM IST (Indian Standard Time) | 12:30 AM CST | 🔵 India only |
| 1:00 PM IST (Indian Standard Time) | 1:30 AM CST | 🔵 India only |
| 2:00 PM IST (Indian Standard Time) | 2:30 AM CST | 🔵 India only |
| 3:00 PM IST (Indian Standard Time) | 3:30 AM CST | 🔵 India only |
| 4:00 PM IST (Indian Standard Time) | 4:30 AM CST | 🔵 India only |
| 5:00 PM IST (Indian Standard Time) | 5:30 AM CST | 🔵 India only |
| 6:00 PM IST (Indian Standard Time) | 6:30 AM CST | |
| 7:00 PM IST (Indian Standard Time) | 7:30 AM CST | |
| 8:00 PM IST (Indian Standard Time) | 8:30 AM CST | |
| 9:00 PM IST (Indian Standard Time) | 9:30 AM CST | 🟢 CST only |
| 10:00 PM IST (Indian Standard Time) | 10:30 AM CST | 🟢 CST only |
| 11:00 PM IST (Indian Standard Time) | 11:30 AM CST | 🟢 CST only |
Explore Kolkata — Top Attractions & Travel Guide
Discover top attractions, local tips and hidden gems in Kolkata on india-guide.in — India's curated travel destination guide.
Explore Kolkata on india-guide.in →Best Time to Call Chicago from Kolkata
Kolkata (9 AM–6 PM IST) and Chicago (9 AM–5 PM CST) do not have simultaneous business hours. The closest window for calls: 5:30–7:00 PM IST = early morning Chicago time — works for brief handoffs. Alternatively, use async tools (email, Slack) for daily coordination.
⏰ DST reminder: Chicago is 11h 30m behind IST in winter (CST) and 10h 30m behind in summer (CDT). The Chicago Mercantile Exchange (CME) opens at 8:30 AM CST, which is 8:00 PM IST in winter — Indian traders must adjust their schedules seasonally.
Kolkata, India
Kolkata is eastern India's commercial and cultural hub, and serves as the gateway to north-east India and Bangladesh. The city's jute, tea, and coal trade built British India. Today it houses the Calcutta Stock Exchange and is a growing IT destination. Kolkata's intellectual and literary tradition makes it India's cultural capital. It is the closest major Indian city to South-East Asia, with strong historic trade ties.
- Gateway to North-East India and Bangladesh
- Calcutta Stock Exchange — India's second oldest
- India's dominant jute, tea, and coal trading centre historically
- Closest major India city to South-East Asian markets
Chicago, USA
Chicago is the USA's third largest city and a major hub for finance, healthcare, manufacturing, and the Indian-American community. The Chicago Mercantile Exchange (CME) is the world's largest derivatives exchange, directly impacting Indian commodities and currency markets. The suburb of Naperville/Schaumburg hosts one of the USA's densest Indian-American populations.
- CME Group — impacts Indian commodity markets daily
- Naperville has largest Indian-American community in Illinois
- Midwest hub for Indian IT services industry
- Direct flights from Delhi on American Airlines
Frequently Asked Questions
What is the time difference between Kolkata and Chicago?
When do clocks change in Chicago and how does it affect IST?
Chicago is 11h 30m behind IST in winter (CST) and 10h 30m behind in summer (CDT). The Chicago Mercantile Exchange (CME) opens at 8:30 AM CST, which is 8:00 PM IST in winter — Indian traders must adjust their schedules seasonally.