Time Zone Converter
TimezoneCast converts times between any pair of time zones accurately and without guesswork. City-time conversions use rules from the IANA tz database — the same authoritative source used by operating systems, browsers, and programming languages worldwide.
Daylight saving time is handled automatically. Whether you're converting in January or July, in the middle of a DST transition week or outside of one, the offset used reflects the actual UTC offset at that moment — not a static guess. Conversions work for any date, not just today.
Abbreviation conversions
Fixed-abbreviation answers, plus clearly labelled city clocks, DST status and local-time tables.
City-to-city conversions
Overlap windows for calls, chats, or meetings — with live clocks and working-hours highlighting.
- New York → London
- London → New York
- Los Angeles → Tokyo
- Tokyo → Los Angeles
- Berlin → New York
- New York → Berlin
- San Francisco → London
- London → San Francisco
- New York → Los Angeles
- Los Angeles → New York
- Chicago → London
- London → Chicago
- Toronto → London
- London → Toronto
- Sydney → New York
- New York → Sydney
- Singapore → London
- London → Singapore
- Dubai → London
- London → Dubai
- London → Tokyo
- Tokyo → London
- New York → Singapore
- Singapore → New York
Specific-time conversions
Quick answers: what time is 9AM EST in PST? 3PM GMT in IST?
How TimezoneCast handles accuracy
IANA tz database. City offsets and DST rules are supplied by the runtime’s timezone data, based on the IANA Time Zone Database (tzdata). Rule updates depend on the server or browser receiving updated timezone data. This is the same database that powers your phone's calendar and every major cloud platform.
Automatic DST handling. EST means UTC−5, and GMT means UTC+0. Fixed-abbreviation answers preserve those meanings. City-time planning uses the offset for the selected date, including daylight saving time.
Any date, not just today. Use the interactive planner to choose a different date. The reference tables below the planner describe the stated reference date and do not change when you move the planner.