Live World Clock
It renders multiple city clocks using browser time zone data instead of hard-coded UTC offsets.
World Clock
BulkCalculator Time Tools
World Clock
Free world clock with IANA time zones, DST-aware city times, searchable presets and local browser rendering.
How to use World Clock
- Open the World Clock page and use the default example if you want a quick test.
- Enter preset city or iana time zone in the tool panel.
- Press the primary action button or use the listed keyboard shortcut when available.
- Read the result as city time, local date and current gmt offset, then copy, export or print it if needed.
Formula and algorithm
World times use Intl.DateTimeFormat with IANA time zone IDs, so DST rules come from the browser.
This tool runs in your browser. If the tab is backgrounded or the device sleeps, visible updates or alerts may be delayed. Notifications and Wake Lock reduce that risk where supported, but they are not a guarantee.
Worked example
New York, London and Tokyo. The expected output is Shows current DST-aware offsets such as New York -4, London +1 and Tokyo +9 when applicable.
{
"tool": "World Clock",
"input": "New York, London and Tokyo.",
"output": "Shows current DST-aware offsets such as New York -4, London +1 and Tokyo +9 when applicable."
}Use cases
- Remote teams
- Travel planning
- Global meetings
- Market hours
- Family calls
Pro tips and gotchas
- Never hard-code offsets for cities that observe DST.
- Offsets can change by date.
- Search by city name or country.
- Add only the cities you need.
- Verify critical meeting times near DST transitions.
Frequently Asked Questions
How to compare time zones for a meeting
Add the cities of every participant to the world clock display. The current time in each city shows side by side, so you can see overlapping working hours instantly. Pick a meeting time that falls within reasonable hours for everyone — usually 9 AM to 6 PM local. The clock updates in real time and accounts for daylight saving automatically, so you don't accidentally pick a time that's 5 AM somewhere in the world.
What time is it in new york and london now
Add both cities to the world clock display and the current local times appear side by side. New York is 5 hours behind London during standard time and 4 hours behind during summer (when both cities observe daylight saving but with slight date differences). The clock handles DST automatically, so the displayed times are accurate without you having to track which season either city is in. Useful for cross-Atlantic meetings, calls, and time-sensitive emails.
How to check world time zones online
Search for a city by name or pick from a list. The world clock adds it to your display and shows the current local time. Add as many cities as you need — the clock handles dozens without slowing down. The displayed times update in real time and respect daylight saving rules for each region. Useful for businesses with international clients, travellers planning calls home, and anyone working with distributed teams across multiple continents.
How to find meeting time across time zones
Add every participant's city to the world clock. Look at the current times side by side and identify the hours when all locations are within their working hours (typically 9 AM to 6 PM). That overlap is your meeting window. Some world clocks include a meeting planner mode that highlights overlapping hours visually, making the choice obvious. Useful for global teams, client calls, and coordinating events across regions.
What is utc time now compared to local time
The world clock shows UTC alongside your local time. UTC (Coordinated Universal Time) doesn't observe daylight saving, so the offset between UTC and your local time changes by an hour during summer if you're in a DST region. So if you're at UTC+5:30 (India) it stays UTC+5:30 year-round, but if you're at UTC+0 (London) you'll show as UTC+1 during British Summer Time. Useful for tech logging, scientific timing, and aviation.
How does daylight saving affect world clock times
The clock adjusts automatically. When a city observes daylight saving (springs the clock forward in spring, back in autumn), the displayed local time changes by an hour overnight on the transition day. Different countries switch on different dates, so for a few weeks each year the time differences between regions are slightly off from their usual offset. The world clock tracks each region's DST rules, so the displayed times stay accurate year-round.
How to see multiple city clocks online
Search for cities by name, click Add, and they appear in your world clock display. Add as many as you need — for global teams, you might have 10 to 15 cities. Each city shows its current local time, day, and date. Some tools let you reorder cities, group them by region, or save the list for next time you visit. Useful for international businesses, expat communications, and travellers tracking home and destination times.
Glossary
- UTC
- Coordinated Universal Time, the reference time standard used for offsets and date math.
- DST
- Daylight Saving Time, a seasonal clock change that can affect wall-clock schedules.
- IANA time zone
- A named time zone such as America/New_York used by browsers for DST-aware rendering.
- Tab-title timer
- A timer state shown in the browser tab title so it remains visible while multitasking.
- Wake Lock
- A browser feature that can ask a device to keep the screen awake during active timing.
- localStorage
- Browser storage used here for settings and saved tool state on the same device.
- Input format
- Preset city or IANA time zone.
- Output format
- City time, local date and current GMT offset.
References and sources
- ISO 8601 for week-number rules.
- 5 U.S.C. section 6103 for US federal holidays.
- IANA Time Zone Database for time zone identifiers.
- The Pomodoro Technique, Francesco Cirillo, 1987 for Pomodoro method.
- US Department of Labor FLSA for overtime context.
- NIST Time and Frequency Division for time-keeping standards.