World Clock

About this World Clock

The World Clock displays live local time in 10 of the world's most populated and globally significant cities. Times update every second directly in your browser using the Intl.DateTimeFormat API, which automatically accounts for Daylight Saving Time and timezone rules. No server requests are needed — everything runs locally for instant accuracy.

Why a World Clock Saves Real Time Every Day

A world clock looks like a simple idea, but it eliminates a surprisingly time-consuming mental task that recurs throughout every international workday. Instead of mentally calculating "London is 5 hours ahead... or is it 4 right now because of DST?" you get a clean, live display of exactly what time it is in 12 major cities, all at once. The analog clock faces make it easy to scan times at a glance across multiple cities — you can see immediately whether Tokyo and London are in business hours simultaneously, or whether São Paulo and New York have a usable overlap window. All times update every second using the browser's Intl API with proper IANA timezone rules, so Daylight Saving Time is handled automatically for every city without any manual adjustment.

Key Features

• 12 major world cities: New York, London, Paris, Dubai, Mumbai, Singapore, Tokyo, Sydney, São Paulo, Los Angeles, Hong Kong, and Moscow — covering all major inhabited regions and the world's most active business hubs.
• Analog + digital clock faces: Each city shows both an analog clock with hour, minute, and second hands, and a digital time readout. The analog format makes relative time differences scannable at a glance.
• Live second-by-second updates: The JavaScript setInterval loop refreshes all 12 clocks every second using the Intl.DateTimeFormat API. Times are always current — no need to refresh the page.
• Full date display: The calendar date is shown below each clock in weekday-month-day format, catching overnight crossovers. When it's Monday in New York, it may already be Tuesday morning in Tokyo.
• DST-aware via IANA timezones: Each city uses its proper IANA timezone identifier (e.g., America/New_York, Europe/London), so DST transitions are handled automatically — London and New York both shift correctly at their respective transition dates.

Real-Life Use Cases

• Remote team overlap planning: Check at a glance whether your Singapore and London teammates are both in working hours right now, before deciding whether to ping someone immediately or wait for their morning.
• Travel departure planning: Before a flight, verify the current time in your destination city against your arrival time to calibrate expectations for jet lag and local schedule.
• Financial market hours: Quickly check whether the NYSE (New York), LSE (London), or TSE (Tokyo) is currently open by comparing the live local times.
• Global event and stream scheduling: Confirm whether a scheduled live event time works for audiences in multiple regions by glancing at the current time across relevant cities.
• Personal "is it too early to call?" check: Before calling a friend, colleague, or family member in another country, check whether they're likely awake and in reasonable hours.

Who Can Use This Tool

Remote workers and managers on distributed teams who need a quick daily-use reference, travelers who regularly move between time zones and want an immediate orientation to local time elsewhere, financial professionals monitoring overlapping market hours, event coordinators planning global broadcasts, freelancers who work with clients across multiple continents, and anyone who reaches for a second tab to google "what time is it in [city]" more than once a day.

Tips & Best Practices

• Watch the date, not just the time: When it's 11pm Monday in New York, it's already 12pm Tuesday in Tokyo. The date shown below each clock prevents the classic mistake of scheduling a "Monday morning" meeting that falls on Tuesday for half the participants.
• Dubai and India don't observe DST: The Dubai–London and Mumbai–London gap shifts by one hour when London enters or exits British Summer Time. If you rely on a fixed mental offset, update it at the DST boundary.
• Bookmark this page as a pinned tab: If you regularly coordinate across more than two time zones, keeping this page open as a browser tab costs nothing and eliminates repeated searches throughout the day.
• São Paulo has opposite-season DST: Brazil observes DST in the southern summer (October–March), which is the northern winter. The São Paulo–New York gap therefore changes in the opposite direction from what you'd expect, shifting in October and again in March.
• Use the Timezone Converter for future scheduling: This World Clock shows live current time. When you need to convert a specific future date and time — say, planning a meeting for next Tuesday — use the Timezone Converter tool linked below the FAQ for exact results.