"What When" is a Chrome extension developed by undefined82 that simplifies event creation in Google Calendar. With this minimal yet powerful tool, users can effortlessly generate events using natural language input. By typing phrases like "buy groceries at 6" or "hike Sunday at 11 am - 2 pm," users can quickly create events. Upon hitting Enter, the extension opens a new tab with the event pre-created in Google Calendar, allowing users to make final adjustments or directly save the event.

This open-source extension offers a user-friendly experience, enabling users to input event details in their own words efficiently. By following simple tips provided, such as specifying the event title before the date and using shorthand expressions for dates and times, users can streamline event creation seamlessly.