Timezone Converter & World Clock — Timezone, Meeting Planner, UTC & More
Timezone Converter & World Clock
Convert times between any timezone, check live world clocks, plan meetings across timezones, and compute time differences.
All processing happens locally in your browser — timezone data from your system's IANA database.
Timezone Convert: Select source and target timezones and a date/time to convert. Your local timezone is detected automatically.
Meeting Planner: Add attendee timezones and see color-coded 24-hour time slots indicating overlap quality.
World Clock: View live time for multiple cities simultaneously. Times update every second.
DST Status: Check whether Daylight Saving Time is currently active for any timezone.
What is a timezone?
A timezone is not just an offset from UTC — it is a set of rules (base offset, Daylight Saving Time schedule, and its history of past changes) maintained in the IANA time zone database under names like America/New_York or Europe/Berlin. Two cities at the same longitude can sit in different zones because the boundary follows politics, not geography.
Offsets are not all whole hours — India is UTC+05:30 and Nepal UTC+05:45 — and a zone’s offset has changed over history, so “what time was it in Berlin in 1980” needs the rules, not just today’s offset.
