targetTime = sourceTime + (targetOffset - sourceOffset) hoursTime zones are defined as offsets from UTC (Coordinated Universal Time). To convert from one zone to another, subtract the source offset to get UTC, then add the target offset. The calculator handles fractional offsets like India (UTC+5:30) and adjusts the date when conversion crosses midnight.
Pick a source time and time zone, then a target time zone. See the equivalent local time.
Pick a date and time in one zone, then pick another zone to see the equivalent time. The converter handles 17 major time zones from Hawaii to New Zealand, including India's half-hour offset. It also adjusts the date when conversion crosses midnight in either direction.
A 3 PM meeting in New York is 8 PM in London, 9 PM in Paris, and 4 AM the next day in Tokyo. Scheduling across time zones is a recurring source of missed calls and confused calendars. This converter takes the math off your plate so the meeting time is right the first time.
You came here because
Common situations
- International meeting scheduling: Find a meeting time that works in multiple time zones.
- Remote team coordination: Translate working hours between distributed offices.
- International travel: Calculate when to call home from a destination time zone.
- Live event timing: Convert sports, broadcast, and concert times to your local zone.
Under the hood
How the calculation works
- 1Pick the source date and time in the date picker.
- 2Pick the source time zone from the dropdown.
- 3Pick the target time zone you want to convert to.
- 4The calculator subtracts source offset, adds target offset.
- 5The result shows the equivalent local time, including any date change.
Show me
A real example
Example: 3 PM New York to Tokyo
- 1Source: 3 PM EST (UTC-5)
- 23 PM + 5 hours = 20:00 UTC
- 3Tokyo is UTC+9, so 20:00 UTC + 9 hours = 05:00 next day
Watch out for
What can go wrong
- Forgetting Daylight Saving Time: New York is UTC-5 in winter and UTC-4 in summer. London is UTC+0 in winter and UTC+1 in summer. DST adjustments change the offset by one hour.
- Confusing GMT with UK local time: GMT is a fixed UTC offset. UK clocks follow GMT in winter and BST (GMT+1) in summer. "London time" depends on the season.
- Skipping the date change: Time zones that wrap past midnight roll to the next or previous day. Always check the date along with the time.
- Using fractional offsets wrong: India is UTC+5:30, not UTC+5. Newfoundland is UTC-3:30. Half-hour and quarter-hour offsets are real and matter.
Glossary
Related concepts
| Term | Definition |
|---|---|
| UTC (Coordinated Universal Time) | The primary time standard worldwide. All time zones are defined as offsets from UTC. Replaced GMT in technical contexts. |
| Daylight Saving Time | A seasonal one-hour shift used in some countries. The converter uses standard offsets; add or subtract one hour during DST periods. |
| IANA time zones | The official database of time zones used by computers. Identifiers like "America/New_York" capture the city, not the fixed offset. |
Make it better
Pro tips
- Pick a common reference time: For recurring meetings, agree on UTC. Everyone can convert UTC to their local time without confusion.
- Use 24-hour format for cross-zone scheduling: 15:00 is unambiguous. 3:00 could be morning or afternoon. The risk of confusion grows with the time-zone gap.
- Mark Daylight Saving Time periods explicitly: In emails, write "3 PM ET" (which handles DST) rather than "3 PM EST" (which means winter time specifically).
- Verify with a third source for important events: For weddings, flights, and live broadcasts, cross-check the time on two independent tools. Time zone bugs are common in calendar apps.
Common questions
Frequently asked questions
Quick reference
3 PM EST in Major World Cities
New York at 3:00 PM (UTC-5)
| City | Local time | Day |
|---|---|---|
| Los Angeles | 12:00 PM | same |
| Chicago | 2:00 PM | same |
| New Yorktypical | 3:00 PM | same |
| London | 8:00 PM | same |
| Paris | 9:00 PM | same |
| New Delhi | 1:30 AM | next day |
| Tokyo | 5:00 AM | next day |
| Sydney | 6:00 AM | next day |
For related calculations, try the Time Converter, Countdown Calculator, or Date Difference. Browse all Calculator Online calculators for the full catalog.
Methodology
This calculator uses the standard time zone converter formula. Results match those from established financial, scientific, and health references.
Reviewed by
Calculator Online Editorial Team. All formulas verified against authoritative sources before publication.
Last updated
2026-05-24