World Clock

What this tool does

Add and reorder cities to compare local date, weekday, UTC offset, difference from your location and daylight-saving changes. Your city list stays in localStorage.

Input: dates, times, time zones or timer settings.

Output: calculated dates, times, zones or timer results.

How to use it

1. Enter the date, time, duration or time-zone values required by the tool in World Clock.
2. Review the available options, then run World Clock and read any warning or validation message.
3. Check the actual output before copying, downloading or using it in another system.

Common uses

World Clock is useful when you need to add and reorder cities to compare local date, weekday, UTC offset, difference from your location and daylight-saving changes. Your city list stays in localStorage.

Privacy and limitations

World Clock runs in the browser where the feature allows it. Time calculations can depend on time-zone databases, daylight-saving rules and device clock accuracy.

Browser performance, file size, format support or device permissions can affect results. Verify output independently for formal documents, finance, identity or business data.