CET vs IST time zone comparison

How CET and IST compare

India Standard Time runs four hours and thirty minutes ahead of Central European Time during the European winter, and three hours and thirty minutes ahead during European summer (CEST). Frankfurt and Paris to Bangalore is a heavily-trafficked corridor for European banks, automotive, pharma, and IT services. The gap is narrower than the UK-India gap (which is 5h30 in winter), so the overlap window is correspondingly wider. The practical shared window is 12 PM to 4 PM CET (4:30 PM to 8:30 PM IST), which catches the European afternoon and the late Indian working day. Push the call later than 5 PM CET (9:30 PM IST) and the India side is at dinner. Push it earlier than 12 PM CET (4:30 PM IST) and the European side is still on morning email. The half-hour offset trips up calendar tools that round to the nearest hour; double-check converted times before sending invites. India does not observe daylight saving, so the gap shifts from 4h30 in European winter to 3h30 in European summer. This means a standing 2 PM Frankfurt meeting becomes 6:30 PM Bangalore in winter and 5:30 PM Bangalore in summer, which is comfortable in both seasons.

Working-hour overlap

Functional overlap from 12 PM to 5 PM CET (4:30 PM to 9:30 PM IST), with 2 PM CET the typical anchor.

When to schedule

Default to 2 PM CET (6:30 PM IST in winter, 5:30 PM IST in summer) for cross-zone meetings. Both sides are well into their working day. For longer working sessions, 1 PM CET (5:30 PM IST in winter, 4:30 PM IST in summer) gives the India side a fuller buffer before end-of-day fatigue. For follow-the-sun handoffs, India end-of-day write-ups (6:30 PM IST, 2 PM CET in winter) hand off cleanly to Europe at start-of-afternoon. Avoid recurring weekly meetings later than 5 PM CET (9:30 PM IST) — attendance degrades fast.

Notable context

European automotive (Volkswagen, BMW, Mercedes-Benz, Stellantis) and European pharma (Bayer, Sanofi, Novartis, Roche) all run major Indian operations and coordinate with Bangalore, Pune, and Hyderabad on a daily basis. Deutsche Bank, BNP Paribas, and Société Générale all have large Indian back-office centers and run morning-Europe to evening-India coordination calls. The corridor is less famous than US-India and UK-India but is in fact equally trafficked by enterprise value; the gap is just narrower and the working pattern feels less exotic.