Time Zone Converter: Never Miss a Meeting Across the World
Your teammate in Casablanca logs on at 9 AM. Your client in Dubai is already three hours ahead. Your New York boss is waking up while you are having lunch. In a remote-first world, time zones decide who sleeps, who works, and who shows up to a meeting at 2 AM. This guide explains how time zones and daylight saving actually work, and how a free time zone converter keeps every meeting on time.
How Time Zones Actually Work
The Earth is divided into 24 main time zones, each roughly 15 degrees of longitude. Time is measured relative to UTC (Coordinated Universal Time): London is UTC+0 in winter, Paris UTC+1, Dubai UTC+4, New York UTC−5, Tokyo UTC+9. When you know two zones' UTC offsets, the difference is simple subtraction.
Daylight Saving: Why the Difference Changes Twice a Year
Many countries shift clocks forward one hour in spring and back in autumn. Because countries change on different dates — and some (like Japan, China and most of Africa) do not change at all — the difference between two cities can shift by an hour across the year. Our converter uses your device's official time zone database, so daylight saving is applied automatically and correctly.
Scheduling Meetings Across Continents
- The golden overlap rule: aim for a slot where both teams are within 9 AM–5 PM
- Mid-morning for one side usually works for the other
- Rotate meeting times so the same team isn't always the 7 AM one
- State times in UTC in the invite to avoid ambiguity
- Use a converter to double-check before confirming
Working Remotely: Your Personal World Clock
Keep your team's key cities at hand: headquarters, the office you coordinate with, and clients. Our converter shows any two zones side by side with the current time and the exact difference — perfect for answering 'what time is it there now?' in one glance.
The Most Useful City Pairs to Know
| Pair | Typical difference (winter) |
|---|---|
| New York – London | 5 hours (London ahead) |
| London – Dubai | 4 hours (Dubai ahead) |
| Dubai – Tokyo | 5 hours (Tokyo ahead) |
| Casablanca – Paris | 1 hour (Paris ahead) |
| New York – Tokyo | 14 hours (Tokyo ahead) |
| London – Sydney | 11 hours (Sydney ahead) |
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Frequently Asked Questions
Pick UTC as one of the two zones in our converter — it shows the current UTC time instantly.
Subtract their UTC offsets. Our converter does this automatically, including daylight saving.
Yes — it uses your device's IANA time zone database, so DST is applied automatically.
24 main zones, but with fractional offsets and variations, the IANA database lists over 500.