World Clock

How to use it

1. The board shows your local time, UTC and a few major cities right away, ticking every second — no input needed.
2. To add a city, pick a time zone from the list and press Add. To remove one, press the × on its card. Your local card always stays.
3. Each card shows the city, the time with seconds, the date, the offset (UTC±N, computed live including daylight saving) and a day/night mark. Copy a card’s time with the Copy button.

Example

Local · UTC · Shanghai · London · New York · Tokyo

Local     7:00:00 PM   Dec 31, 2025   UTC-5
UTC        12:00:00 AM  Jan 1, 2026    UTC+0
Shanghai   8:00:00 AM   Jan 1, 2026    UTC+8
London     12:00:00 AM  Jan 1, 2026    UTC+0
New York   7:00:00 PM   Dec 31, 2025   UTC-5
Tokyo      9:00:00 AM   Jan 1, 2026    UTC+9

The board updates every second; the values above are a snapshot at a single instant (00:00 UTC on Jan 1). Offsets are computed live, so New York reads UTC-5 in winter and UTC-4 in summer.

Rules, limits and known issues

• Time zones offered: your local zone, UTC and 10 major IANA zones (Shanghai, Tokyo, Singapore, Kolkata, Dubai, London, Paris, New York, Los Angeles, Sydney). There is no global city search — add what you need from the list.
• Offsets are computed for the current instant using your browser’s time-zone data, so daylight saving is included (New York is UTC-5 in January, UTC-4 in July). Historical offsets depend on the tzdata your browser ships.
• Day/night is judged by the local hour: 06:00–17:59 is day, otherwise night.
• City names are localized for the 12 listed zones; any other IANA zone would show its id (e.g. Asia/Kolkata) rather than a translated name.
• No world map, no meeting planner, no interval comparison — those belong to a time-zone converter. The board never leaves the page and never enters the URL.

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