Time Zone Calculator
Live world clocks, instant time conversion across 50+ cities, meeting overlap planner, and flight arrival calculator — all in one place.
Time Zone Calculator
4 tools — pick a tab below
New York
USA · GMT-4
Mon, Mar 30
London
UK · GMT+1
Mon, Mar 30
Dubai
UAE · GMT+4
Mon, Mar 30
Mumbai
India · GMT+5:30
Mon, Mar 30
Singapore
Singapore · GMT+8
Mon, Mar 30
Tokyo
Japan · GMT+9
Mon, Mar 30
UTC Offset Reference
| City | Offset |
|---|---|
| 🇺🇸Los Angeles | GMT-7 |
| 🇨🇦Vancouver | GMT-7 |
| 🇲🇽Mexico City | GMT-6 |
| 🇺🇸Chicago | GMT-5 |
| 🇨🇴Bogotá | GMT-5 |
| 🇺🇸New York | GMT-4 |
| 🇨🇦Toronto | GMT-4 |
| 🇧🇷São Paulo | GMT-3 |
| 🇦🇷Buenos Aires | GMT-3 |
| 🇬🇭Accra | GMT |
| 🇬🇧London | GMT+1 |
| 🇳🇬Lagos | GMT+1 |
| 🇲🇦Casablanca | GMT+1 |
| 🇫🇷Paris | GMT+2 |
| 🇩🇪Berlin | GMT+2 |
| 🇪🇸Madrid | GMT+2 |
| 🇮🇹Rome | GMT+2 |
| 🇳🇱Amsterdam | GMT+2 |
| 🇨🇭Zurich | GMT+2 |
| 🇸🇪Stockholm | GMT+2 |
| 🇵🇱Warsaw | GMT+2 |
| 🇪🇬Cairo | GMT+2 |
| 🇿🇦Johannesburg | GMT+2 |
| 🇹🇷Istanbul | GMT+3 |
| 🇷🇺Moscow | GMT+3 |
| 🇸🇦Riyadh | GMT+3 |
| 🇶🇦Doha | GMT+3 |
| 🇰🇼Kuwait City | GMT+3 |
| 🇰🇪Nairobi | GMT+3 |
| 🇦🇪Dubai | GMT+4 |
| 🇵🇰Karachi | GMT+5 |
| 🇮🇳Mumbai | GMT+5:30 |
| 🇱🇰Colombo | GMT+5:30 |
| 🇧🇩Dhaka | GMT+6 |
| 🇹🇭Bangkok | GMT+7 |
| 🇮🇩Jakarta | GMT+7 |
| 🇸🇬Singapore | GMT+8 |
| 🇲🇾Kuala Lumpur | GMT+8 |
| 🇭🇰Hong Kong | GMT+8 |
| 🇨🇳Shanghai | GMT+8 |
| 🇹🇼Taipei | GMT+8 |
| 🇯🇵Tokyo | GMT+9 |
| 🇰🇷Seoul | GMT+9 |
| 🇦🇺Sydney | GMT+11 |
| 🇦🇺Melbourne | GMT+11 |
| 🇳🇿Auckland | GMT+13 |
Business Hours Key
Working across time zones?
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UTC & Offsets
All time zones are defined as offsets from UTC (Coordinated Universal Time). UTC+5:30 means 5 hours and 30 minutes ahead of UTC.
Daylight Saving Time
Many countries shift clocks by 1 hour in summer (spring forward, fall back). This calculator uses your browser's live DST data.
Date Line Crossings
Converting between zones far apart can shift the date forward or backward. The converter flags +1 day / −1 day automatically.
Flight Arrivals
Arrival time = Departure time + Flight duration + Time zone difference. A 14h flight from NYC to Tokyo that departs at 10:00 lands at ~14:00 the next day.
Schedule globally, work efficiently
Golden overlap hours
For US + Europe: 14:00–17:00 UTC is business hours for both. For Europe + Asia: 07:00–09:00 UTC works well.
Always state the zone
When scheduling meetings, always include the timezone — e.g. '3pm EST' not '3pm'. Avoid confusion and missed calls.
Async first
If there's no overlap window, go async: record a Loom, write a detailed doc, and use the converter to reference times clearly.
Respect off-hours
The world clock flags night-time zones in dark mode. Avoid scheduling meetings that fall outside 09:00–20:00 for any participant.
Remote team or freelancer?
Invoice clients in any currency, any timezone.
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