This world clock lets you track the current local time in multiple cities simultaneously. Add any city from a library of 120+ locations and see live-updating times, UTC offsets, and day/night status side by side. All time calculations use the Intl.DateTimeFormat API with IANA time zone data, so daylight saving time transitions are handled automatically.
Add all relevant cities and look for overlap during normal business hours (9 AM–5 PM) in each location. Common cross-timezone meeting windows: London–New York: 2–5 PM London / 9 AM–12 PM New York. New York–London–Singapore: 8–9 AM ET is afternoon London and late evening Singapore — rotate meeting times to share the inconvenience fairly.
UTC (Coordinated Universal Time) is the global reference point. A UTC+5:30 offset means that location is 5.5 hours ahead of UTC. Offsets change during daylight saving time: the US switches in March/November, Europe in late March/October, and some regions observe DST on different schedules — creating weeks where gaps between regions temporarily change by ±1 hour.
Many major business hubs have no DST and maintain fixed UTC offsets year-round: India (UTC+5:30), China (UTC+8), Japan (UTC+9), Singapore (UTC+8), UAE (UTC+4), Saudi Arabia (UTC+3), and most of Africa and Southeast Asia. This makes them easier to schedule against, as their time relationship with your location never changes.