Timezone converter

Compare one UTC instant across IANA timezones with side-by-side clocks and date changes.

The same moment, everywhere

Amsterdam14:00:002026-09-06UTC+02:00 · same UTC date

New York08:00:002026-09-06UTC-04:00 · same UTC date

Tokyo21:00:002026-09-06UTC+09:00 · same UTC date

2026-09-06T12:00:00.000Z

UTC instantYYYY-MM-DDTHH:mm:ss[.SSS]Z

Timezone 1

Timezone 2

Timezone 3

Custom IANA timezones

Custom timezone 1Example: Pacific/Chatham

Custom timezone 2Example: Pacific/Chatham

Custom timezone 3Example: Pacific/Chatham

Processed on your device

How it works & useful details

How it works & limits

Start with an explicit UTC instant and compare up to four distinct IANA timezones. Daylight saving is applied for that instant using your browser’s timezone database. A local time during a DST overlap may occur twice, so this tool deliberately starts from UTC.

UTC years 1900–2100 are supported. Historical and future timezone rules depend on the database shipped with your browser and can change. Clock faces show hours/minutes; digital clocks show seconds. The saved UTC instant preserves milliseconds. No timezone is detected or fetched remotely.

Your working space

Explore the live preview, then save a copyable text report. Inputs stay on this device and are cleared by refreshing. Dates use the Gregorian calendar, including before its historical introduction.