Time Conversion Calculator
IST to CET Converter
Convert India Standard Time to CET with date-aware logic, a 24-hour table, meeting planner, and copy-ready result.
Convert IST to CET
Choose a date and time in India Standard Time. The calculator will show the matching CET time.
Suggested meeting times
24-hour IST to CET conversion table
Full-day conversion for the selected date.
| India Standard Time | CET | Meeting note |
|---|---|---|
| Select a time and convert to generate the table. | ||
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IST to CET: quick answer
To convert India Standard Time (IST) to Central European Time (CET), subtract 4 hours and 30 minutes. For example, 6:00 PM IST is 1:30 PM CET. This calculator treats IST as UTC+05:30 and CET as the fixed standard-time offset UTC+01:00.
If the European destination is observing Central European Summer Time (CEST) at UTC+02:00, subtract 3 hours and 30 minutes instead. Use a location and date for current city time rather than assuming CET applies throughout the year.
How to convert IST to CET
- Start with the India Standard Time date and time.
- Subtract 4 hours and 30 minutes.
- If the result moves before midnight, use the previous CET calendar date.
- Keep both timezone abbreviations in the final result.
Example: 3:00 AM IST – 4 hours 30 minutes = 10:30 PM CET on the previous calendar date.
CET and CEST are not interchangeable
| European label | UTC offset | Difference from IST |
|---|---|---|
| Central European Time (CET) | UTC+01:00 | CET is 4:30 behind |
| Central European Summer Time (CEST) | UTC+02:00 | CEST is 3:30 behind |
| Paris, Berlin or regional local time | Changes by date | Use an IANA location and event date |
The European Commission states that participating EU countries move to summer time on the last Sunday of March and return to standard time on the last Sunday of October. CET is the standard-time label; CEST is the summer-time label.
Common IST to CET conversions
| IST | CET | Date note |
|---|---|---|
| 6:00 AM | 1:30 AM | Same day |
| 9:00 AM | 4:30 AM | Same day |
| 12:00 PM | 7:30 AM | Same day |
| 4:00 PM | 11:30 AM | Same day |
| 6:00 PM | 1:30 PM | Same day |
| 3:00 AM | 10:30 PM | Previous day |
Calendar-date changes
IST times before 4:30 AM convert to the previous CET calendar date. For example, 1:00 AM IST is 8:30 PM CET on the previous day. Include the converted date when arranging international calls, travel or deadlines.
Best India-to-Central-Europe meeting window
A practical shared-business-hours window is 1:30 PM-6:00 PM IST, corresponding to 9:00 AM-1:30 PM CET. Recurring meetings tied to a European city should be reviewed when the destination changes between CET and CEST.
Formula, methodology and verification
The calculation subtracts the CET offset of +60 minutes from the IST offset of +330 minutes, producing a fixed difference of 270 minutes. Verification covers half-hour arithmetic, same-day and previous-day results, midnight and year-boundary rollover, 12-hour and 24-hour formats, and reciprocal IST to CET to IST test cases.
When this fixed-offset converter is appropriate
Use this page when the destination explicitly specifies CET, Central European Time, UTC+01:00, or a standard-time schedule. Do not use it as a year-round substitute for local time in Paris, Berlin, Rome, Madrid or another seasonal European location. The IANA Time Zone Database records regional offset and daylight-saving changes by location.
Frequently asked questions
How far behind IST is CET?
Fixed Central European Time is exactly 4 hours and 30 minutes behind India Standard Time.
What is 6:00 PM IST in CET?
6:00 PM IST is 1:30 PM CET on the same calendar date.
What is 3:00 AM IST in CET?
3:00 AM IST is 10:30 PM CET on the previous calendar date.
Is CET the same as CEST?
No. CET is UTC+01:00, while CEST is UTC+02:00. Their India conversions differ by one hour.
Does India change its clocks?
No. Modern India Standard Time remains at UTC+05:30 throughout the year.
Related converters and official references
Starting with Central European Time? Use the CET to IST Converter. For fixed UTC, use the IST to UTC Converter. For Greenwich Mean Time, use the IST to GMT Converter.
References: European Commission summer-time arrangements, IANA Time Zone Database, and CSIR-NPL Indian Standard Time metrology.