World Clock

What World Clock does

One IANA zone per line (e.g. Asia/Shanghai). Optional ISO instant; default now.

This URL is only for World Clock (datetime · world clock). Show one instant across time zones. Other Date & time tools on Tool-You look similar in the chrome, so the job definition below is the part that belongs to World Clock alone: One IANA zone per line (e.g. Asia/Shanghai). Optional ISO instant; default now.

How to use World Clock

1. Confirm you need World Clock, not Time Zone Converter (Show a time in two common IANA zones.). Address: /datetime/world-clock.
2. Enter the numbers or dates World Clock uses. Show one instant across time zones.
3. Read the result as World Clock defines it — not as Meeting Planner (Map an hour in zone A to zone B.). One IANA zone per line (e.g. Asia/Shanghai). Optional ISO instant; default now.
4. World Clock is an estimate in the browser, not professional advice. Runs locally in the browser. Invalid input disables or fails visibly. Not medical/legal advice where noted.
5. Need a different formula? Try Meeting Planner (Map an hour in zone A to zone B.) instead of stretching World Clock.

When not to use World Clock

Skip World Clock when a neighbor tool matches better — start with Time Zone Converter or Meeting Planner — or when the description already warns the job will fail. In the tool’s own words: One IANA zone per line (e.g. Asia/Shanghai). Optional ISO instant; default now.

Questions about World Clock

What does World Clock do that other Date & time pages on this site do not?

One IANA zone per line (e.g. Asia/Shanghai). Optional ISO instant; default now. Short version: Show one instant across time zones.

Does World Clock upload my file or text to Tool-You servers?

No. World Clock runs in this browser tab. Files stay on the device. Limit note: Runs locally in the browser. Invalid input disables or fails visibly. Not medical/legal advice where noted.

Should I use Time Zone Converter instead of World Clock?

Use World Clock when you need Show one instant across time zones. Use Time Zone Converter when you need Show a time in two common IANA zones. They share a category (Date & time) but not the same job.

What are the limits of World Clock?

Runs locally in the browser. Invalid input disables or fails visibly. Not medical/legal advice where noted. Also: One IANA zone per line (e.g. Asia/Shanghai). Optional ISO instant; default now.