Time Zone Converter
Convert a time of day between major world time zones, such as IST, UTC, EST, and JST.
- Free to use
- Accurate results
- No registration required
- Works on all devices
Enter a time and choose a from/to time zone to convert between major world time zones.
Use 24-hour HH:MM format, e.g. 09:00 or 21:30.
Your result
22:30
Converted time
Day change-1 day
AI explanation
Formula
Converted time = time + (to-zone UTC offset − from-zone UTC offset)Worked example
9:00 AM IST to EST
| Field | Value |
|---|---|
| Time (24-hour) | 09:00 |
| From time zone | ist |
| To time zone | est |
| Converted time | 22:30 |
| Day change | -1 day |
Assumptions
- Uses each zone's standard-time UTC offset, not adjusted for daylight saving time — DST start/end dates vary by country and change over time, so this is a simplification. Check whether your zones currently observe DST for fully precise results.
Frequently asked questions
Does this account for daylight saving time?
No — it uses each zone's standard-time offset year-round. During DST periods, actual local time in that zone may be one hour different from this calculator's result.
Why does the result sometimes show a day change?
Time zones far apart can push the converted time past midnight into the next or previous calendar day — the "day change" output tells you which.
What is the offset for India Standard Time?
IST is UTC+5:30 year-round — India does not observe daylight saving time.