Timezone Converter
Convert a specific moment from one time zone to another.
- America/New_York
How timezone conversion works
Every date and time is ultimately an absolute moment — a point on the UTC timeline. A timezone converter translates that moment from one local representation to another. This tool uses Luxon's IANA-aware date library, which applies the correct UTC offset and DST rule for every zone at the specific date you enter. The result includes the converted local time, full UTC, and the Unix epoch (seconds since 1970-01-01 00:00:00 UTC).
Common timezone conversions
The most frequently searched conversions are between the US time zones (ET, CT, MT, PT) and Europe (GMT/BST, CET/CEST) or Asia (IST, JST, SGT, HKT). A few key offsets to keep in mind: New York (ET) is UTC−5 in winter and UTC−4 in summer. London (GMT/BST) is UTC+0 in winter and UTC+1 in summer. India (IST) is always UTC+5:30 — no DST. Japan (JST) is always UTC+9. Australia/Sydney (AEDT/AEST) ranges from UTC+10 to UTC+11 depending on season.
The US–EU clock-change gap
The United States and European Union change their clocks on different dates. In spring, the US moves forward on the second Sunday of March while Europe waits until the last Sunday of March — a 2–3 week window each year. In autumn, Europe falls back on the last Sunday of October while the US waits until the first Sunday of November. During these transition windows, the offset between, say, New York and London shifts by 1 hour from its usual value — a common source of scheduling confusion for international teams.
Frequently asked questions
- What is daylight saving time?
- Daylight saving time (DST) is a seasonal practice of moving clocks forward 1 hour in spring and back in autumn to extend evening daylight. Not all countries observe it — India, China, and Japan, for example, stay on the same offset year-round.
- How do I convert EST to GMT?
- Set From to America/New_York and To to Europe/London. The converter handles DST automatically — Eastern Standard Time is UTC−5, Eastern Daylight Time is UTC−4, while the UK observes GMT (UTC+0) in winter and BST (UTC+1) in summer.
- What is the difference between UTC and GMT?
- For everyday use, UTC and GMT are interchangeable. UTC is the atomic-clock scientific standard; GMT is a geographical time zone. The UK observes GMT in winter and switches to BST (+1) in summer, while UTC never changes.
- Can I convert a past or future date?
- Yes — type any date and time into the From field. The converter uses the IANA tz database, so it correctly applies historical DST rules even for past dates.