World Clock
Live time in cities around the world. Add or remove cities, toggle 12/24h.
Current Time Around the World
A world clock displays the current local time in multiple cities simultaneously, accounting for UTC offsets and Daylight Saving Time rules. It is essential for remote teams, international scheduling, and anyone coordinating across timezones.
Under the hood, all times derive from a single source: the current Unix timestamp in UTC. Each city's time is computed by applying its IANA timezone rules to that UTC moment. This means the world clock is always accurate, even during DST transitions.
Time Differences — Major Business Hubs
| City | Timezone | UTC Offset (Standard) | DST |
|---|---|---|---|
| New York | America/New_York | UTC−5 | Yes (→ UTC−4 in summer) |
| Los Angeles | America/Los_Angeles | UTC−8 | Yes (→ UTC−7 in summer) |
| London | Europe/London | UTC+0 | Yes (→ UTC+1 in summer) |
| Paris / Berlin | Europe/Paris | UTC+1 | Yes (→ UTC+2 in summer) |
| Dubai | Asia/Dubai | UTC+4 | No |
| Mumbai | Asia/Kolkata | UTC+5:30 | No |
| Singapore | Asia/Singapore | UTC+8 | No |
| Tokyo | Asia/Tokyo | UTC+9 | No |
| Sydney | Australia/Sydney | UTC+10 | Yes (opposite hemisphere) |
Scheduling Across Timezones
Finding overlap hours
If New York is 9am–5pm and London is 2pm–10pm, the overlap is 2pm–5pm London / 9am–12pm New York.
The Monday/Tuesday trap
When it is Monday 8pm in San Francisco, it is already Tuesday morning in Asia. Always use UTC for scheduling across the date line.
DST transition weeks
When the US and EU switch DST on different weeks, time differences shift by an hour for 1–3 weeks. Use IANA timezone IDs to handle this automatically.
Meeting time converters
Pick a UTC time and display it in each participant's local timezone. This avoids the "which 3pm?" confusion.
Frequently Asked Questions
How many timezones are there in the world?▼
There are about 38 distinct UTC offsets currently in use (counting half-hour and 45-minute offsets). The IANA timezone database contains over 600 named zones, many of which are historical aliases or subdivisions.
What is the most common timezone for international business?▼
UTC is the universal reference. For scheduling, many international teams default to UTC, CET (Central European Time, UTC+1), or EST (Eastern Standard Time, UTC−5) depending on where the majority of participants are located.
Which countries span the most timezones?▼
Russia spans 11 timezones. The United States (including territories) spans 11 as well. France spans 12 (including overseas territories). China uses a single timezone (UTC+8) despite its geographic span of 5 natural zones.
What is the International Date Line?▼
The International Date Line (IDL) is an imaginary line at roughly 180° longitude where the calendar date changes. East of the IDL is one day behind west of the IDL. It zigs around island nations to avoid splitting countries across two dates.