Convert any Unix timestamp or date to all major world timezones simultaneously. Covers UTC, all US timezones (ET, CT, MT, PT), European cities, Asian cities, Australia, and more. All conversions happen in your browser — no data is sent to any server.
Offsets such as UTC-05:00 are not enough for many real products because daylight saving rules change during the year. Names such as America/New_York or Europe/London let the runtime apply the correct historical and future rules.
A timestamp is an instant. A meeting at 9:00 AM every Monday is a local civil-time rule. Store instants for events that already happened, and store timezone-aware rules for future recurring schedules.
Read UTC vs GMT for terminology and what a Unix timestamp means before designing timezone fields.