World Clock

Remote work has made one question unavoidable: “Is it a reasonable hour to call?” Answering it requires knowing the local time in multiple cities at once — not the UTC offset, not a conversion formula, just the actual time on a clock in that city right now. This World Clock shows exactly that for up to 50+ cities simultaneously, updating every second, with each card displaying the city name, UTC offset, current time with seconds, and the current day and date. Build your own board by adding the cities your team is in and removing the ones you don't need.

Building Your Custom City Board

The default board shows eight strategically chosen cities: New York, London, Dubai, Mumbai, Singapore, Tokyo, Sydney, and UTC. Together they cover every major global business timezone and include UTC as the universal reference point. Use the dropdown to add any of the 50+ available cities; click the × on any card to remove it. The board adjusts to fill the available width automatically. For a fixed two-zone conversion with a specific date and time, the Timezone Converter is purpose-built for that.

UTC: The Anchor That Never Shifts

Coordinated Universal Time (UTC) has no daylight saving offset and never changes. Every other timezone in the world is defined as UTC± an offset. Keeping a UTC card on your board gives you an instant reference: when you see London at GMT+1 in summer and the UTC card, you can immediately calculate that London is 1 hour ahead. When the US moves to daylight saving, the New York card changes from UTC-5 to UTC-4, and the UTC card stays the same. For developers, UTC is especially important — server logs, API timestamps, and database records are almost universally stored in UTC.

Daylight Saving Time Handled Silently

On the night that the US or EU changes its clocks, this clock updates automatically — no refresh needed, no manual offset editing. The browser's IANA timezone database contains the exact DST changeover dates for every country. India, China, Japan, the UAE, and most African countries do not observe daylight saving — their offset cards remain constant year-round. Countries that do observe DST update the displayed offset immediately after the changeover moment.

24-Hour vs 12-Hour Format

The 24h/12h toggle at the top of the board switches all city clocks simultaneously. 24-hour time eliminates AM/PM ambiguity and is the global professional standard — aviation, military, medical, and most international business communication uses 24-hour time. 12-hour AM/PM is common in everyday speech in the US and India. The toggle applies immediately to all visible clocks and persists for your session. When scheduling across regions, 24-hour format is less prone to miscommunication than AM/PM.

Global Financial Market Hours at a Glance

Add the relevant cities to monitor when major exchanges open and close in your local time:

• Tokyo (Asia/Tokyo) — TSE opens 09:00, lunch break 11:30–12:30, closes 15:30
• Mumbai (Asia/Kolkata) — BSE/NSE opens 09:15, closes 15:30
• Dubai (Asia/Dubai) — DFM opens 10:00, closes 14:00
• London (Europe/London) — LSE opens 08:00, closes 16:30
• New York (America/New_York) — NYSE/NASDAQ opens 09:30, closes 16:00

Keeping these cities on your board lets you see overlap windows and off-hours gaps at a glance. To convert a specific market open time to your local timezone precisely, use the Timezone Converter.

Privacy

The World Clock runs entirely in your browser. No data — your selected cities, time format preference, or any other interaction — is transmitted to ToollyX servers. The clock reads only from your device's system clock and the browser's built-in IANA timezone database.