# Timehint FAQ > The Timehint FAQ: what the extension does in Gmail, how it suggests a sender's time zone, what it stores in your browser, and how to get it when it ships. Source: https://timehint.app/faq This is the Timehint FAQ: the questions people ask before installing a time zone extension, answered in full rather than in a sentence. If you're looking for step-by-step instructions instead, the [guide to using Timehint](https://timehint.app/how-to-use) covers every screen and setting, and [features](https://timehint.app/features) has a page for each part of the product. ## Timehint FAQ: questions and answers ### What is Timehint? A Chrome extension for people who work across time zones. It keeps the people and places you work with in a browser side panel with their live local times, and it puts those times where you read and write email: on the messages you open in Gmail and in the draft you're writing. It's built for Chrome and Brave on desktop. ### What does Timehint do in Gmail? Four things. On a message from someone you've saved, a chip shows what time it is for them now and what time it was for them when they sent it. On a sender you haven't saved, an **Add timezone** chip lets you save their time zone, often with a suggestion for you to confirm. In messages you receive, a time written with a time zone, such as "5pm EST", gets your local time beside it. And while you write to a saved contact, Timehint offers to change a time like "5pm IST" into their time. Nothing in your draft changes until you click. ### How does Timehint know which time zone a sender is in? You tell it, with help. When you click **Add** on a sender's **Add timezone** chip, Timehint looks for clues in the message and the open thread: a location line in the signature, such as "Based in Berlin"; a phone number's country code; or a single time zone the sender wrote, such as "2 pm Indonesia time". The suggestion comes with the text it was based on, and you confirm or change it. Timehint doesn't guess from an email address, because a .de address doesn't mean the sender is in Germany. Details: [save a contact's time zone in Gmail](https://timehint.app/add-timezone). ### Does Timehint work outside Gmail? The side panel opens next to any tab, so your cast and the timeline are a click away wherever you are in the browser. The features inside messages (the sender chip, **Add timezone** and **Use their time**) work in Gmail on the web. In Google Calendar, each saved guest on an event you open shows their local time. Timehint doesn't add anything to other websites or to desktop email apps. ### Does it work in the Gmail mobile app? No. Timehint is a desktop browser extension, and browser extensions don't run in mobile mail apps. There's no Timehint app for phones or tablets. ### Which browsers does Timehint support? Desktop Chrome and Brave, version 114 or later. That's the version where the browser side panel exists. Other Chromium-based browsers may work but aren't tested or supported. ### Do I need an account? No. You install the extension, confirm where you're based, and start: every feature works without an account, and your contacts and settings live in the browser you installed it in. A free account is optional. Sign in under **Account** in Settings to back up your contacts, places and a few settings and keep them in sync across the browsers where you sign in. ### Is Timehint free? Yes. Every feature is free during early access, and there are no paid plans. ### When can I install Timehint? Not yet: Timehint isn't listed on the Chrome Web Store. Click **Install extension on Chrome** on any page of this site to join the waitlist. We'll email you once it can be installed, and an early-access link may reach you before the public launch. Those are the only messages you'll get from us, and we'll delete your email address whenever you ask. ### Does it handle daylight saving time and abbreviations like IST, CST and BST? Yes. Daylight saving time is handled automatically, because every abbreviation, name and city resolves to a real time zone and the offset comes from that zone on the relevant date. For abbreviations with more than one meaning, Timehint uses stated defaults: IST is India Standard Time, CST is US Central, BST is British Summer Time and GST is Gulf Standard Time. If you mean Ireland, Israel or China, write the full name ("Israel Standard Time") or a city ("3pm in Shanghai"). More: [how Timehint reads times and time zones](https://timehint.app/how-it-works). ### Does Timehint ever change what I wrote? Only when you click. In a draft, it shows a chip offering your recipient's time; **Use their time** replaces the time you typed, and closing the chip leaves the draft untouched. In messages you receive, the original text is never altered: your time is added beside it. ### What is "your cast"? The people and places you've saved. People have a name, an email address and a time zone; places are just cities. They appear in the side panel with live local times, and each gets a band on the **Today in your cast** timeline. ### How does Timehint choose the best time to meet? **Overlap windows** lists up to three stretches of the day when at least two of your cast are inside working hours, and scores them: coverage counts for half, length for a quarter (up to three hours) and how civil the hour is in your own working day for the last quarter. The highest score is marked Best. If there's no shared working time that day, it says so rather than inventing a slot. Details: [find meeting times across time zones](https://timehint.app/meeting-overlap). ### Can I set different working hours for each person? Not in this version. **Your working day** is a single setting, 9:00 AM to 6:00 PM by default, applied to everyone in your cast. ### Does Timehint upload my email? No. Timehint reads times and sender details in the messages you open, inside your browser, and never uploads the text of your emails. If you sign in to the optional account, only the contacts, places and settings you've saved sync to it. The extension asks for storage and side panel permissions, identity when it offers **Continue with Google**, and access to mail.google.com and calendar.google.com, the only websites it works on. ### Where are my contacts stored, and what happens if I uninstall? Saved contacts are kept in the extension's local storage, in the browser profile you installed it in. If you're signed in, they're also backed up to your Timehint account and synced to your other browsers. Your settings, home time zone and saved places live in Chrome's built-in storage sync, which Chrome may copy to other browsers you're signed in to. Removing the extension deletes the contacts it kept locally: if you were signed in, sign in again after reinstalling and they come back. Otherwise, use **Download your contacts** in Settings first if you want a copy. This version can export contacts to a file but can't import one. ### How do I get my data deleted? For the extension: remove it from your browser's extensions page, which deletes the contacts it stored locally. If you created an account, email us from its address and we'll delete the account and everything synced to it. For this website: the waitlist stores the email address you entered, and we'll delete it whenever you ask. Write to us from the address you signed up with. The details are in the [privacy policy](https://timehint.app/privacy). ### Something isn't working. What should I check? Start with [troubleshooting](https://timehint.app/how-to-use#troubleshooting), which covers the common cases: no chip on a message, a sender showing the wrong zone, times an hour off around a clock change, and a contact missing from the side panel. If that doesn't solve it, [contact us](https://timehint.app/contact#bug-report) with your browser version and what you saw. ## Still have a question? [Contact the Timehint team](https://timehint.app/contact) and we'll answer within one business day. You can also read [what Timehint does](https://timehint.app/features), [how it works](https://timehint.app/how-it-works), or [why it exists](https://timehint.app/about).