無料オンライン世界時計
世界中の都市やタイムゾーンの現在時刻を確認します。
Frequently Asked Questions
Which cities are shown by default?
The default set covers major global business hubs: New York, London, Dubai, Mumbai, Singapore, Tokyo, Sydney, Los Angeles, and UTC. Customize by adding or removing any city.
Does the world clock adjust for daylight saving time?
Yes. All displayed times update automatically for DST transitions using the IANA time zone database (same as your phone and operating system). DST status is shown next to each city.
Can I find a time that works for multiple cities simultaneously?
Use the world clock to scan all cities at once and identify overlap in working hours. For structured overlap calculations, use the Time Zone Converter tool's multi-city comparison mode.
What is the current time in Tokyo right now?
Open the world clock and add Tokyo (or it may be in the default set). Japan Standard Time (JST) is UTC+9 with no DST. It's always UTC+9 year-round.
Can I share my world clock configuration?
Copy the URL after configuring your cities — the city selection is encoded in the URL parameters, making it sharable. Recipients see the same city configuration when they open the link.
Is the 世界時計 free to use?
Yes, the 世界時計 on Allio Tools is completely free with no sign-up or registration required. It works directly in your browser.
How does the 世界時計 work?
世界中の都市やタイムゾーンの現在時刻を確認します。 No data is sent to a server — everything runs locally in your browser for maximum privacy and speed.
Do I need to install anything to use the 世界時計?
No installation needed. The 世界時計 runs entirely in your web browser on any device — desktop, tablet, or mobile.
Is my data safe when using the 世界時計?
Completely safe. The 世界時計 processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.
Does the 世界時計 work offline?
After the page loads for the first time, the 世界時計 works without an internet connection for all client-side processing. Tools that fetch live external data (such as DNS or network lookups) require an active connection.
Does the 世界時計 automatically account for daylight saving time?
Yes. The 世界時計 uses your browser's built-in time zone data, which includes daylight saving time rules for all supported time zones, keeping results accurate year-round.
How does the 世界時計 handle daylight saving time and leap years?
The 世界時計 uses your browser's built-in Intl and Date APIs, which automatically account for daylight saving time transitions, leap years, and regional time zone rules. You do not need to make any manual adjustments for these calendar events.
Does the 世界時計 work on all browsers?
Yes. The 世界時計 is built with standard browser APIs and works on all modern browsers including Chrome, Firefox, Safari, and Edge — on both desktop and mobile. No plugins, extensions, or third-party software are required.
How do I save or export my results from the 世界時計?
Select and copy the result text to paste into any document or app. For image tools, a Download button saves the file directly to your device. Your browser's built-in screenshot function also captures results quickly. No account or login is required.