Free browser tool

Time zone converter

Convert date/time values between IANA time zones and inspect UTC, offset, and localized output.

Input and settings

How to use

Convert date/time values between IANA time zones and inspect UTC, offset, and localized output.

Enter or paste the source data.
Adjust only the options you need.
Run the tool, verify the result, then copy or download it.

What to know before using it

Regions with daylight-saving rules can have different offsets by season. Convert an actual date using a timezone identifier rather than memorizing a fixed difference.

Common failure points

A fixed offset such as UTC+9 has no DST rule.
Check the weekday when conversion crosses midnight.
Including an IANA timezone name in meeting notices reduces ambiguity.

Practical example

Tokyo 10:00 converts differently to New York in winter and summer, so use the real meeting date.