CET to IST Time Zone Converter
CET is Central European Time — Paris, Berlin, Madrid, and Rome (CET in winter, CEST in summer). IST is India Standard Time, the clock in Mumbai, Delhi, and Bengaluru. India runs ahead of Central Europe, and because it never changes its clocks while Europe does, the gap is 4.5 hours in winter and 3.5 hours in summer. This converter picks the right one for any date.
Enter a date and time to convert.
Daylight saving is applied automatically for the date you pick. Labels like PST/EST name the zone (Pacific/Eastern); the real abbreviation shifts to PDT/EDT during daylight saving, and gmt here means London (GMT in winter, BST in summer) while utc stays fixed.
The time difference
India Standard Time is ahead of Central Europe. In winter it's 4.5 hours ahead; in summer, when Europe is on CEST, that narrows to 3.5 hours. The gap changes because only one side moves — India holds still all year while the European clock springs forward in late March and falls back in late October. The odd half-hour comes from India's own offset.
A worked example
Take 9:00 AM in Central Europe. On January 15, 2026 that is 1:30 PM in Mumbai the same day. On July 15, 2026 the same 9:00 AM reads 12:30 PM in Mumbai, because Europe is on summer time and has closed an hour of the gap. India's clock never moved — Europe's did.
Daylight saving & the abbreviation caveat
CET is really two labels for one place: CET in winter, CEST in summer. IST has no such split — India does not observe daylight saving and never changes. So the one-hour swing between January and July comes entirely from the European side. The converter tracks the date you choose and applies the correct offset, so a result never looks wrong.
When you'll use it
Handy for scheduling calls with a Bengaluru or Mumbai team, lining up a European workday against Indian business hours, planning flights, and coordinating handoffs across an afternoon-to-evening overlap.
Frequently asked questions
How far ahead of CET is India?
In winter, India is 4.5 hours ahead of Central Europe; in summer it narrows to 3.5 hours. India's half-hour offset is why the gap isn't a whole number.
Why does the gap change between winter and summer?
India Standard Time never observes daylight saving, but Central Europe springs forward on March 29, 2026 and falls back on October 25. When Europe jumps an hour, the distance to India's fixed clock shrinks by an hour.
Does India ever use daylight saving?
No. IST stays the same all year, which makes it the steady side of this conversion — all the seasonal movement comes from Europe.