世界時計とは？

無料のオンライン世界時計。世界各国の主要都市の現在時刻とタイムゾーンを同時に表示。

Coordinating across time zones is one of the biggest challenges for remote teams, international travelers, and global businesses. World Clock displays the current time in 15+ major cities simultaneously, with live-updating clocks, day/night indicators, and a full comparison table.

The default view shows a curated set of major world cities — New York, London, Tokyo, Dubai, Sydney, and more — each displayed as a card showing the city name, country flag emoji, current time with seconds, and a visual day/night indicator (sun icon for daytime, moon for nighttime).

You can add additional cities from the available list of 15+ locations, which covers every major time zone. Remove cities you do not need with the trash button on each card. The display is designed for quick scanning — the day/night indicators let you immediately see which team members are currently working and which are offline.

The full comparison table at the bottom shows all available cities with their current time, time zone offset (e.g., UTC-5), and current date. This is useful for printing or sharing as a reference document. All clocks update every second with the device's current system time, adjusted for each time zone's offset including daylight saving time where applicable.