I have gotten annoyed by timezone calculations for hopefully the final time. Here's a static html page you can download and save locally to roughly compare times in different timezones (just hours; you're on your own for minutes) • without daylight savings time • with daylight savings time The way I'm naively imagining using this: • Scroll to the timezone you know the time in. • Click on the nearest hour. • It'll highlight that column all over the page. • Scroll or find the timezone you care about. ◦ If you're not in a whole-number timezone (Hello India), you'll need to do some additional mental arithmetic by comparing nearby rows. Right now you need to know if you're currently in Daylight Savings Time. Which is often beyond me, but I'm not yet sure what to do about that.. Inspired by Bret Victor, but of course the inevitable mistakes are all mine.