Timezone Converter — Convert Time Across 20+ Timezones

Coordinated Universal Time (UTC) is the primary time standard by which the world regulates clocks and time. It is not adjusted for daylight saving time, making it a stable reference point for all other time zones. Every time zone on Earth is expressed as UTC plus or minus an offset — for example, New York is UTC−5 in winter and UTC−4 in summer, while Tokyo is always UTC+9 year-round. When scheduling a meeting between colleagues in London, São Paulo, and Seoul, the easiest approach is to convert all local times to UTC first, confirm they match, then convert back to each participant's local time. UTC offsets range from UTC−12:00 (Baker Island) to UTC+14:00 (Line Islands), spanning a full 26-hour spread across the globe. Understanding UTC offsets is essential for developers working with APIs, database timestamps, log files, and international scheduling systems.

Daylight Saving Time (DST) shifts clocks forward by one hour during warmer months to extend evening daylight. DST observance varies significantly by country and region. The United States, Canada, most of Europe, and parts of Australia observe DST, while Japan, China, India, and most of Africa and Southeast Asia do not. In the Northern Hemisphere, clocks typically spring forward in March and fall back in October or November. In the Southern Hemisphere (Australia, New Zealand, parts of South America), DST runs from October to April instead. This means the offset between Sydney and New York changes twice a year. The converter automatically accounts for current DST rules using the browser's built-in Intl.DateTimeFormat API, so you always see accurate current offsets without needing to track transition dates manually.

Scheduling across time zones requires more than arithmetic. Always confirm whether a city is currently observing DST — a colleague in London is at UTC+0 in winter but UTC+1 in summer. Be explicit about the time zone when sharing meeting times; write "3:00 PM JST" rather than just "3:00 PM". Note that some time zones have half-hour or quarter-hour offsets — India (UTC+5:30), Nepal (UTC+5:45), and parts of Australia (UTC+9:30) are common examples. Also be aware that international date line crossings can shift the calendar date by a full day: a flight departing Tokyo on Monday evening may arrive in Los Angeles on Monday morning. The world clock view in this tool lets you compare multiple cities side by side and find overlap windows where everyone is within normal working hours.

The converter shows live clocks for 20 cities by default, reflecting the current moment. To convert a specific future or past time — such as a scheduled meeting time — enter the desired time in the input field before clicking Convert. The tool displays that exact moment expressed in every supported time zone simultaneously. This is especially useful when sending calendar invites: enter the meeting time in your local zone, then read off the equivalent times for each attendee's city directly from the results panel. For recurring events like weekly team syncs, keep note of any cities that observe DST so you can anticipate the one or two weeks per year when the overlap window shifts.

The live world clock cards display the current local time for each city continuously. This at-a-glance view is valuable for remote teams who need to know at a moment's notice whether a colleague in another region is within working hours. The 20 cities covered span all major inhabited time zones, from Honolulu (UTC−10) through the Americas, Europe, Africa, and Asia to Auckland (UTC+12). If you are looking for a city not in the list, find a nearby city in the same time zone — Houston uses the same zone as Chicago (CT), and Osaka shares JST with Tokyo. The world clock is also a quick sanity check after a DST transition: if the gap between two cities suddenly looks different from what you expected, the tool reflects the correct post-transition offset.