World Clock: Compare Live Time Across Multiple Cities
Coordinating across time zones is one of the most common challenges in remote work, international business, and travel planning. Our World Clock displays the current time in multiple cities simultaneously, updating every second in real time, so you can instantly see who is in working hours and who is asleep.
Add any of 35+ cities from the Americas, Europe, Asia, Oceania, and Africa using the searchable dropdown. Popular cities appear as quick-add buttons for one-click access. A sun icon marks daytime cities (6 AM–6 PM) and a moon icon marks nighttime, helping you schedule calls and meetings at a glance. Remove any city with the × button.
Daylight saving time is handled automatically for every city using IANA timezone data. India's nine major cities — Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, and Ahmedabad — are all included, all sharing IST (UTC+5:30).
Times are derived from the browser's Intl.DateTimeFormat API using IANA timezone identifiers. The browser applies current DST rules automatically — no manual offset adjustment needed.
Understanding Time Zone Offsets
UTC/GMT: Coordinated Universal Time is the baseline. All other time zones are expressed as offsets from UTC.
IST (India Standard Time): UTC+5:30. India does not observe daylight saving time. This offset is fixed year-round for all Indian cities.
EST/EDT (US Eastern): UTC-5 in winter (EST), UTC-4 in summer (EDT). New York, Toronto, and Miami all follow this pattern.
CET/CEST (Central Europe): UTC+1 in winter (CET), UTC+2 in summer (CEST). London is a special case — it uses GMT (UTC+0) in winter and BST (UTC+1) in summer.
JST (Japan): UTC+9, fixed year-round. Japan does not observe DST.
Best Cities to Know for International Scheduling
New York (EST/EDT): Reference point for North American Eastern business hours (9 AM–5 PM ET).
London (GMT/BST): Financial and media hub; bridges US and European working hours.
Dubai (GST, UTC+4): No DST; a stable mid-point between Europe and Asia.
Mumbai/IST (UTC+5:30): India's largest business city; the half-hour offset makes scheduling distinctive.
Singapore (SGT, UTC+8): Asian financial hub; overlaps with China, Hong Kong, and Korea at the same offset.
Tokyo (JST, UTC+9): Japan's tech and business hub; no DST makes scheduling predictable.
Sydney (AEDT/AEST): Australia's financial capital; note that Australian DST runs October–April (opposite to northern hemisphere).
Practical Examples
Scheduling a Call Between Bengaluru and New York
Finding a time that works for both IST and EST.
- 1.Add cities: Bengaluru (IST, UTC+5:30) and New York (EST, UTC-5)
- 2.Overlap window: When New York is 8:00 AM EST, Bengaluru is 6:30 PM IST
- 3.Best slot: 8–10 AM New York = 6:30–8:30 PM Bengaluru — both in working or early evening hours
- 4.Tip: Avoid scheduling after 6 PM IST as that puts New York before 8 AM
Checking Working Hours Across Three Continents
A distributed team spanning London, Dubai, and Singapore.
- 1.Add cities: London (GMT), Dubai (GST, +4), Singapore (SGT, +8)
- 2.When London opens at 9 AM: Dubai is 1 PM, Singapore is 5 PM
- 3.Overlap window: 9 AM–5 PM London = 1 PM–9 PM Dubai = 5 PM–1 AM Singapore
- 4.Best slot: 9–11 AM London puts Dubai at 1–3 PM and Singapore at 5–7 PM — all in acceptable hours
Frequently Asked Questions
How often does the world clock update?
The clock updates every second automatically using JavaScript's setInterval. No page refresh is needed — all city times tick forward in real time.
Does the clock account for daylight saving time?
Yes. All times use the browser's Intl API with IANA timezone identifiers (e.g., America/New_York, Europe/London). The browser automatically applies current DST rules for each city.
Why do Mumbai, Delhi, Bengaluru, and other Indian cities show the same time?
India has a single time zone — Indian Standard Time (IST), UTC+5:30 — covering the entire country. All Indian cities share the same offset.
What does the sun/moon icon indicate?
The ☀️ sun icon indicates daytime (6 AM to 6 PM local time) and the 🌙 moon icon indicates nighttime. This helps quickly identify which cities are in working hours.
Can I add and remove cities?
Yes. Use the city dropdown to search and add any of the 35+ supported cities. Click the × button on any clock card to remove it. Popular city quick-add buttons appear for cities not yet in your list.
What cities are supported?
The clock supports 35+ cities across five regions: Americas (New York, Los Angeles, Chicago, Toronto, Vancouver, Mexico City, São Paulo, Buenos Aires), Europe (London, Paris, Berlin, Madrid, Rome, Amsterdam, Moscow, Istanbul), Asia (Tokyo, Singapore, Hong Kong, Shanghai, Seoul, Bangkok, Dubai, Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad), Oceania (Sydney, Melbourne, Brisbane, Auckland), and Africa (Cairo, Johannesburg, Lagos, Nairobi).
What is the GMT offset shown on each card?
The GMT offset (e.g., GMT+5:30, GMT-5) shows how many hours and minutes the city's current local time differs from UTC/GMT. This offset changes automatically when daylight saving time starts or ends.
Is my data stored or sent anywhere?
No. The world clock runs entirely in your browser. No city preferences or data are sent to any server. If you refresh the page, the default cities (New York, London, Tokyo, Sydney, Mumbai) are restored.