World Clock
World Clock
How to use world clock
- Read the current browser-local clock and its zone.
- Compare the city clocks for the same current instant.
- Use the converter for a future meeting date.
- Use full screen for a larger local clock.
Compare the current time in cities around the world.
How the result is calculated
The calculator validates the required dates, units and range before producing a result. Keep the inputs and the selected convention with the output so another person can reproduce it.
Read all calculation conventionsHow to read your result
Keep the inputs and conventions beside the answer. These values explain what the result measures.
| Result field | Meaning |
|---|---|
| Large clock | Current local time according to this device. |
| City clocks | Displays of the same current instant in the listed IANA zones. |
| Date labels | Local calendar dates can differ between cities at the same instant. |
The world clock compares one current instant
A city can already be on the next calendar date while another is still on the previous one. Current clocks do not predict the offset for a future meeting.
Try the example in the calculator above. Change one input at a time and compare the target, interval and selected rules. For a longer explanation read Planning Meetings Across Time Zones: Use One Shared Instant.
Conventions to keep with your result
The clock follows the device’s current instant. It is not a certified time source. For critical timing confirm the device clock and official schedule.
World Clock: frequently asked questions
Does changing the calendar selector change the big clock?
The big clock is browser-local. The calendar selector controls date-only pages.
Can the clock compare future meeting times?
Use the UTC converter for a chosen future instant.
Does full screen require support?
Yes. If the browser does not support it the clock still works on the page.
Learn the method
All guidesPlanning Meetings Across Time Zones: Use One Shared Instant
Convert a meeting's UTC instant, check local dates and account for clock changes before sharing it.
PST to EST: Dates, Daylight Saving and Meeting Times
Convert Pacific and Eastern times with the right source date, distinguish fixed offsets from local zones, and resolve skipped or repeated hours before sharing a meeting.
Keep exploring
View the tool libraryDays Between Dates
Compare two dates with calendar days, complete weeks and weekday counts. Choose whether to include the end date.
Business Days Calculator
Count working days using your weekend pattern and optional excluded dates. Public holidays are excluded only when entered.
Day of the Week
Inspect a Gregorian date, leap-year rules, ISO week numbers and a printable month calendar.
Time Zone Converter
Convert an exact UTC instant to another IANA time zone.