IST to Rouen Time Converter
CET is 4 hours 30 minutes behind IST. 9:00 AM IST = 4:30 AM CET.
CET is 4 hours 30 minutes behind IST at the moment. To convert IST to Rouen 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). Rouen Time (Rouen time) is used in Rouen, France.
IST here means India Standard Time, not Irish or Israel Standard Time.
IST to Rouen Time time conversion table
IST to Rouen Time on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| IST | Rouen Time |
|---|---|
| 12:00 AM | 7:30 PM−1 |
| 1:00 AM | 8:30 PM−1 |
| 2:00 AM | 9:30 PM−1 |
| 3:00 AM | 10:30 PM−1 |
| 4:00 AM | 11:30 PM−1 |
| 5:00 AM | 12:30 AM |
| 6:00 AM | 1:30 AM |
| 7:00 AM | 2:30 AM |
| IST | Rouen Time |
|---|---|
| 8:00 AM | 3:30 AM |
| 9:00 AM | 4:30 AM |
| 10:00 AM | 5:30 AM |
| 11:00 AM | 6:30 AM |
| 12:00 PM | 7:30 AM |
| 1:00 PM | 8:30 AM |
| 2:00 PM | 9:30 AM |
| 3:00 PM | 10:30 AM |
| IST | Rouen Time |
|---|---|
| 4:00 PM | 11:30 AM |
| 5:00 PM | 12:30 PM |
| 6:00 PM | 1:30 PM |
| 7:00 PM | 2:30 PM |
| 8:00 PM | 3:30 PM |
| 9:00 PM | 4:30 PM |
| 10:00 PM | 5:30 PM |
| 11:00 PM | 6:30 PM |
Conversion table from IST to Rouen Time for 7 Nov 2026. A tick marks hours that fall between 9 AM and 5 PM in both places. +1 means the next day in Rouen Time, −1 the previous day.
- ✓ marks 9 AM–5 PM in both places
- Greyed times are night in the destination (10 PM–6 AM)
How to convert IST to Rouen Time
Subtract 4 hours 30 minutes from the IST time to get Rouen 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 Rouen Time
The time difference between IST and Rouen 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: Rouen Time is 4 hours 30 minutes behind of IST.
- 29 Mar 2026 – 24 Oct 2026: Rouen Time is 3 hours 30 minutes behind of IST.
- 25 Oct 2026 – 31 Dec 2026: Rouen Time is 4 hours 30 minutes behind of IST.
IST and Rouen Time during daylight saving time
- IST does not observe daylight saving time; it stays on UTC+5:30 all year.
- Rouen 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 Rouen Time
IST and Rouen 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.
IST to Rouen Time FAQ
What is the time difference between IST and Rouen 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 Rouen Time?
9:00 AM IST is 4:30 AM CET.
What is 12 PM (noon) IST in Rouen Time?
12:00 PM IST is 7:30 AM CET.
Is Rouen Time ahead of or behind IST?
CET is 4 hours 30 minutes behind IST, so it is earlier in Rouen 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 Rouen Time change for daylight saving time?
Yes. Rouen 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 Rouen Time?
IST and Rouen 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 Rouen Time to IST
Convert IST to other time zones
Convert other time zones to Rouen Time
Learn more
Updated 7 November 2026. Time zone data: IANA tz database.