About Zonewise

What it is

Zonewise is a free time zone converter and meeting planner for distributed teams. Add up to 10 cities or time zones and see them on one timeline, lined up at the same moment, with each place's working hours marked and the hours they share picked out. No account or sign-in is needed.

How the times are worked out

• Every time comes from the IANA time zone database (also called the tz database), the record of time zone rules that operating systems and browsers use. It includes each place's daylight saving rules.
• Pages are prepared on our server, which uses version 2026e of that database. The live timeline in your browser uses your browser's own copy.
• Offsets and time differences are calculated for the date shown, never typed in, so they follow daylight saving changes.
• Short names such as IST or GMT come from a list we keep, because the database does not name every zone. Where we have no short name, the page shows the offset instead, such as UTC+5:45.
• An abbreviation stands for a fixed offset: EST is always UTC-5. A city follows its local clock, so New York is on EST in winter and EDT in summer.
• Working hours are 9 AM to 5 PM in each place. The shared working time is where those hours overlap on the selected date.

Your data

Your list of cities is kept in your own browser. See the privacy policy for what is collected and why.

Found a mistake?

If a time, offset or date looks wrong, email privacy@zonewise.io with the page address and what you expected to see.