Local · Private · Free

Time Zone Converter

Take one date and time and see that exact moment in every city you choose. Daylight saving is handled automatically, with UTC offsets and day-change badges for each zone.

From time zone

Date

Time

Converted locally with your browser's own time-zone database (DST-correct), nothing is sent anywhere.

Find a city / zone

Matching zones

Zone	Date	Time	Offset	Day

No target zones yet, search above and tap + Add.

One moment, every clock

This tool answers "when it's 3 pm Tuesday in Berlin, what time is it in Kolkata?", a single moment converted into as many zones as you like, with the correct daylight-saving rules applied for that specific date. If you instead need to find a time that suits people in several countries by comparing their working hours side-by-side, use the Meeting Planner, its sister tool. Both run entirely on your device, offline, free forever.

About Time Zone Converter

Time Zone Converter is a free, private productivity tool that runs entirely in your web browser. Pick any date and time in a source zone, then instantly see that exact moment in as many cities as you like. DST is handled automatically, so the result is always correct for that specific date. Because everything happens locally on your device, nothing is uploaded to a server. No sign-up or installation required, and it keeps working offline. Like every free tool by Digital Heroes, it is 100% free with no limits.

What you can do

Convert any date and time between hundreds of IANA time zones, DST-correct.

Add unlimited target cities by typing a city name or zone identifier to filter the list.

See UTC offsets and day-change badges so you know at a glance if the meeting lands on a different calendar day.

Switch between 12-hour and 24-hour display with one click.

Copy individual rows or the full table to paste into emails, messages, or calendar invites.

Download a CSV of all converted times for use in spreadsheets or reports.

How to use Time Zone Converter

Open Time Zone Converter in your browser. No signup needed.

Choose your source time zone from the first dropdown, then enter the date and time to convert. Tap Now to pre-fill the current moment.

Search for a target city or zone in the filter box, select it, and tap + Add. Repeat for every zone you need.

Read the converted times in the table. Use the day badges to spot when the moment falls on a different day. Copy a row or download the full CSV when you are done.

Frequently asked questions

Is Time Zone Converter free?

Yes, Time Zone Converter is completely free for everyone. No sign-up, no account and no usage limits.

Is it private? Are my files uploaded anywhere?

No. Time Zone Converter runs entirely in your browser on your own device, so your data never leaves your computer and nothing is uploaded to a server.

Does it work offline?

Yes. This tool is a Progressive Web App, once the page has loaded it keeps working offline, and you can install it as an app from your browser.

Do I need to install anything or create an account?

No. Just open the page and start using it. Installing it as an app is optional and only adds offline convenience.

What does Time Zone Converter do?

Convert any date & time between time zones, DST-aware, with copy-ready results.