IconVault's Timezone Converter converts any date and time between world timezones instantly, showing the result in each zone with daylight saving handled by the browser's own timezone data. The built-in meeting planner lines up four zones side by side so you can pick a slot that works for everyone on the call.

All conversion happens in your browser, nothing is uploaded, and the tool is free with no signup. The honest note: results rely on your browser's timezone database, which is usually current, but double-check against an official source before booking flights or legal deadlines.