IST is UTC+5:30, year-round
India runs on a single offset: Indian Standard Time, fixed at UTC+5:30. No daylight saving. No seasonal shift. The clock stays put while zones to the west jump forward and back.
That half-hour offset means every gap to a European city ends in 30 minutes. You never get a clean whole-hour difference.
CET to IST: winter vs summer gap
Central European Time (CET) is UTC+1. It runs from the last Sunday of October to the last Sunday of March across Belgium, Germany, France, Spain, and most of the mainland.
Winter (CET, UTC+1) to IST (UTC+5:30): 4 hours and 30 minutes. Noon in Berlin is 16:30 in New Delhi.
Summer (CEST, UTC+2) to IST (UTC+5:30): 3 hours and 30 minutes. Noon in Berlin is 15:30 in New Delhi.
On Sunday 29 March 2026, clocks spring forward at 02:00 local. The gap contracts from 4:30 to 3:30.
On Sunday 25 October 2026, clocks fall back at 03:00 local, and the gap returns to 4:30.
GMT to IST: the UK-India difference
The United Kingdom uses Greenwich Mean Time (GMT, UTC+0) in winter and British Summer Time (BST, UTC+1) in summer.
Winter (GMT, UTC+0) to IST (UTC+5:30): 5 hours and 30 minutes. 09:00 in London is 14:30 in Mumbai.
Summer (BST, UTC+1) to IST (UTC+5:30): 4 hours and 30 minutes. 09:00 in London is 13:30 in Mumbai.
The UK-India gap is exactly one hour wider than the CET-India gap, in both seasons.
EET to IST: the eastern perspective
Eastern European Time (EET, UTC+2) and Eastern European Summer Time (EEST, UTC+3) cover Finland, Greece, Romania, Bulgaria, Latvia, Lithuania, Estonia, Moldova, Ukraine, and Cyprus.
Winter (EET, UTC+2) to IST (UTC+5:30): 3 hours and 30 minutes.
Summer (EEST, UTC+3) to IST (UTC+5:30): 2 hours and 30 minutes.
Helsinki calling Mumbai in July faces only a 2.5-hour offset. That is the narrowest gap between India and any territory that observes DST.
Why the Europe to India time difference shifts by exactly one hour
India does not move. The continent’s DST schedule is the only variable.
| Zone | Winter offset to IST | Summer offset to IST |
|---|---|---|
| WET (Portugal mainland, Ireland) | +5:30 | +4:30 |
| CET (Germany, France, Spain mainland) | +4:30 | +3:30 |
| EET (Finland, Greece, Romania) | +3:30 | +2:30 |
The half hour is permanent. No whole-hour offset exists because IST itself sits at UTC+5:30.
When to call India from Europe
Book calls inside India’s typical office window: 09:30 to 17:30 IST. Skip the first 30 minutes. Arrive at 10:00 IST. That gives your contact time to settle.
From CET in winter: dial at 05:30 CET. India opens at 10:00 IST.
From CET in summer: dial at 06:30 CEST.
From GMT in winter: dial at 04:30 GMT.
From BST in summer: dial at 05:30 BST.
For EET callers, the window starts later. Dial at 06:30 EET in winter, 07:30 EEST in summer. The afternoon overlap is generous. Use it.