TimeToZone

IST to Bonn Time Converter

CET is 4 hours 30 minutes behind IST. 9:00 AM IST = 4:30 AM CET.

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ISTfrom
India Standard Time
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Bonn
Bonn, Germany
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CET is 4 hours 30 minutes behind IST at the moment. To convert IST to Bonn Time, subtract 4 hours 30 minutes from the IST time: 9:00 AM IST = 4:30 AM CET.

IST (India Time) is used in India and Sri Lanka (UTC+5:30, no daylight saving time). Bonn Time (Bonn time) is used in Bonn, Germany.

IST here means India Standard Time, not Irish or Israel Standard Time.

IST to Bonn Time time conversion table

IST to Bonn Time on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.

ISTBonn TimeDay
12:00 AM IST7:30 PM CETprevious day
1:00 AM IST8:30 PM CETprevious day
2:00 AM IST9:30 PM CETprevious day
3:00 AM IST10:30 PM CETprevious day
4:00 AM IST11:30 PM CETprevious day
5:00 AM IST12:30 AM CETnight
6:00 AM IST1:30 AM CETnight
7:00 AM IST2:30 AM CETnight
8:00 AM IST3:30 AM CETnight
9:00 AM IST4:30 AM CETnight
10:00 AM IST5:30 AM CETnight
11:00 AM IST6:30 AM CET—
12:00 PM IST7:30 AM CET—
1:00 PM IST8:30 AM CET—
2:00 PM IST9:30 AM CETwork hours
3:00 PM IST10:30 AM CETwork hours
4:00 PM IST11:30 AM CETwork hours
5:00 PM IST12:30 PM CET—
6:00 PM IST1:30 PM CET—
7:00 PM IST2:30 PM CET—
8:00 PM IST3:30 PM CET—
9:00 PM IST4:30 PM CET—
10:00 PM IST5:30 PM CET—
11:00 PM IST6:30 PM CET—
  • Work rows — 9 AM–5 PM in both places
  • Night in the destination (10 PM–6 AM)

How to convert IST to Bonn Time

Subtract 4 hours 30 minutes from the IST time to get Bonn Time.

Example: 9:00 AM IST = 4:30 AM CET.

Across midnight: 1:00 AM IST = 8:30 PM CET (previous day). The date changes, so always check the day as well as the hour.

Time difference between IST and Bonn Time

The time difference between IST and Bonn Time is not the same all year, because the two sides change for daylight saving time on different dates. In 2026 it works out like this:

  • 1 Jan 2026 – 28 Mar 2026: Bonn Time is 4 hours 30 minutes behind of IST.
  • 29 Mar 2026 – 24 Oct 2026: Bonn Time is 3 hours 30 minutes behind of IST.
  • 25 Oct 2026 – 31 Dec 2026: Bonn Time is 4 hours 30 minutes behind of IST.

IST and Bonn Time during daylight saving time

  • IST does not observe daylight saving time; it stays on UTC+5:30 all year.
  • Bonn Time next changes on 28 Mar 2027: clocks go forward one hour at 01:59 local time, from CET (UTC+1) to CEST (UTC+2).

Best time for a meeting between IST and Bonn Time

IST and Bonn Time share 3 hours 30 minutes of the 9 AM–5 PM working day. Any time between 1:30 PM and 5:00 PM IST lands between 9:00 AM and 12:30 PM CET, inside working hours for both.

Plan a meeting across more time zones.

IST to Bonn Time FAQ

What is the time difference between IST and Bonn Time?

Right now CET is 4 hours 30 minutes behind IST. The gap changes 3 times in 2026 because the two sides switch to daylight saving time on different dates.

What is 9 AM IST in Bonn Time?

9:00 AM IST is 4:30 AM CET.

What is 12 PM (noon) IST in Bonn Time?

12:00 PM IST is 7:30 AM CET.

Is Bonn Time ahead of or behind IST?

CET is 4 hours 30 minutes behind IST, so it is earlier in Bonn Time than in IST.

Does IST change for daylight saving time?

No. IST stays on the same offset all year, so conversions never shift for daylight saving time.

Does Bonn Time change for daylight saving time?

Yes. Bonn Time next changes on 28 Mar 2027, when clocks go forward one hour from CET to CEST.

What is the best time for a meeting between IST and Bonn Time?

IST and Bonn Time share 3 hours 30 minutes of the 9 AM–5 PM working day. Any time between 1:30 PM and 5:00 PM IST lands between 9:00 AM and 12:30 PM CET, inside working hours for both.

Related conversions

Convert Bonn Time to IST

Convert IST to other time zones

Convert other time zones to Bonn Time

Learn more

Updated 7 November 2026. Time zone data: IANA tz database.