Free Time Zone Calculator to Convert Between Global Time Zones

A time zone calculator converts a time in one location to the matching local time in another, applying UTC offsets, daylight saving status, and any date change. The multi time zone converter on this page does it for up to six cities at once, so you can see where the working day overlaps.

Most days you don't need one. New York to London is five hours, you know it cold, and you're right. Then it's mid-March. North America has moved its clocks, Europe hasn't, and for three weeks that five is a four. Or you're scheduling with Sydney, where daylight saving runs backwards, so the gap you learned over the summer is wrong by November. Or it's Mumbai at UTC+5:30, where 09:00 your time is 19:30 theirs, and no calendar app says a word about it. The easy conversions are what make you confident enough to get the hard ones wrong.

• A time zone calculator automatically converts times across locations while accounting for UTC offsets, daylight saving time, and date changes, reducing scheduling errors.
• Features like multi-time-zone comparisons, DST awareness, historical and future date support, and world clocks make coordinating meetings, travel, and global events much easier.
• For accurate results, always enter a specific date, use city names instead of countries, and double-check conversions during daylight saving transition periods or whenever the converted time lands on a different calendar day.

You input a time and location, select a target location, and the calculator returns the converted time, accounting for UTC offsets, daylight saving status, and date changes. That's the core function.

The useful part is what happens automatically. When you convert between, say, New York and Tokyo, the calculator handles the 14-hour offset, flags that the date changes, and adjusts for whether either location is currently observing DST. Manual calculation misses these details often enough that it's not worth relying on for anything time-sensitive.

Most tools accept city names rather than requiring you to know the UTC offset, which is more reliable since many large countries span multiple zones.

Multi-zone comparison: View several locations at once rather than running separate conversions. Useful for finding overlapping availability across a global team, such as comparing London, New York, Sydney, and Mumbai in a single view.

DST awareness: Automatically adjusts for spring-forward and fall-back transitions, including the fact that North America and Europe change clocks on different dates. This is where manual calculations most commonly go wrong.

Historical and future date support: Calculate time differences for specific dates rather than just the current moment. Important for planning events months out, when DST status may differ from today.

Shareable conversion links: Send a converted time that renders in each recipient's own local zone, so nobody re-runs the math.

World clock view: Shows current time across saved locations without requiring a conversion each time.

Business meeting scheduling: A 2:00 PM EST call is 7:00 PM GMT for London participants. The trickier cases are during DST transition weeks, when the difference between regions temporarily shifts by an hour.

International travel planning: Arrival times across zones, local business hours at the destination, and scheduling around time differences during a trip.

Remote team coordination: Scheduling across San Francisco (PST), Austin (CST), and Berlin (CET) requires knowing when business hours actually overlap. A zone calculator makes it easy to see that a 9:00 AM PST standup is 6:00 PM CET, workable for some and not for others

Global event broadcasting: Finding a webinar time that works across North America, Europe, and Asia-Pacific involves tradeoffs. A multi-zone comparison view makes those tradeoffs visible.

1. Select your source location. Search by city name for precision, especially in large countries with multiple zones.
2. Select your target location. Same approach: city name over country when available.
3. Enter the specific time and date. Don't skip the date. DST rules for December differ from March, and the calculator needs the date to apply the right offset.
4. Review the result. Check whether the converted time falls on the same calendar day. Pacific to Asian conversions frequently cross into the next day.
5. Verify DST status for both locations. Most calculators show this, but it's worth confirming for dates near transition periods in March and November.

UTC (Coordinated Universal Time) is the global reference point: every local time is expressed as UTC plus or minus a set number of hours. It replaced Greenwich Mean Time as the world standard in 1972 and runs on atomic time rather than astronomical observation.

Common offsets:

• Eastern Time: UTC-5 (standard) / UTC-4 (daylight)
• Pacific Time: UTC-8 (standard) / UTC-7 (daylight)
• Central European Time: UTC+1 (standard) / UTC+2 (daylight)
• Japan Standard Time: UTC+9 (no DST)
• India Standard Time: UTC+5:30 (no DST)

Political and practical considerations mean zone boundaries don't follow longitude neatly. China uses a single UTC+8 offset despite spanning five theoretical zones. India and Iran use half-hour offsets. Newfoundland uses UTC-3:30. These edge cases are where calculators save the most time.

North American zones: Atlantic (UTC-4), Eastern (UTC-5), Central (UTC-6), Mountain (UTC-7), Pacific (UTC-8). Neither Arizona nor Hawaii observes DST, though the Navajo Nation within Arizona does.

European zones: GMT/WET (UTC+0), CET (UTC+1), EET (UTC+2). Most of Europe fits within these three.

Asia-Pacific zones: Japan Standard Time (UTC+9), Australian Eastern Standard Time (UTC+10), New Zealand Standard Time (UTC+12). The largest differences from North American zones are here.

DST shifts clocks forward one hour in spring and back in autumn, changing UTC offsets temporarily. Eastern Time moves from EST (UTC-5) to EDT (UTC-4) in summer, so the difference between New York and Tokyo shrinks from 14 hours to 13.

Key complications:

Different switch dates: Europe changes on the last Sunday in March and the last Sunday in October. North America changes on the second Sunday in March and the first Sunday in November. Twice a year the offset between European and North American cities sits one hour off its normal value. In spring the gap runs two to three weeks depending on the calendar; in autumn it's always exactly one week.

Non-observing regions: Arizona and Hawaii (US), plus China, Japan, India, and many others don't observe DST. Calculating between a DST-observing and non-observing location means the offset changes seasonally even though only one side is moving.

Southern hemisphere reversal: DST in Australia runs opposite to the northern hemisphere, with Sydney springing forward in October and back in April. Queensland, Western Australia, and the Northern Territory don't observe it at all, so Brisbane and Sydney share an offset for half the year and not the other half.

New York (EST) to London (GMT): 1:00 PM EST = 6:00 PM GMT (5-hour difference standard time). Briefly becomes 4 hours when only one region has switched to daylight saving.

Los Angeles (PST) to Tokyo (JST): 9:00 AM PST = 2:00 AM JST the following day (17-hour difference). Any offset large enough to push past midnight moves the calendar date, so always check which day the converted time lands on.

Sydney (AEDT) to Dubai (GST): 3:00 PM AEDT = 8:00 AM GST (7-hour difference in Australian summer). Australia's opposite DST cycle means this offset changes seasonally.

Mumbai (IST) to San Francisco (PST): 10:30 AM IST = 9:00 PM PST the previous day (13.5-hour difference). The half-hour offset and date crossing both require attention.

Even the best time zone calculator is only as accurate as the information you enter.

• Use city names instead of countries. Many countries span multiple time zones, so selecting a city like Chicago or Sydney is much more accurate.
• Always enter a specific date. Time zone offsets can change throughout the year because of daylight saving time.
• Use the 24-hour clock. This avoids AM/PM confusion, especially when working with international teams.
• Pay attention to daylight saving transitions. Mid-March and late October through early November are common periods for scheduling mistakes because regions change clocks on different dates.
• Call out date changes clearly. If the converted time falls on the previous or next day, include that in the meeting invite to avoid confusion.
• Review recurring meetings regularly. A meeting that works today may shift by an hour after seasonal clock changes.
• Double-check important events. For interviews, flights, or major meetings, a quick verification with another trusted time zone tool is worth the extra few seconds.

For remote and distributed teams, converting time zones is only one part of scheduling successful meetings. Once everyone knows the correct local time, they still need a shared place to collaborate without creating confusion around availability or meeting times. Getting the time right is only half the problem. A team spread across four zones does most of its coordinating outside scheduled calls, in the narrow windows where days overlap, and a converter can find those windows without giving anyone a place to use them.

Kumospace is a virtual office platform where distributed teams hold video meetings, use team chat, share screens, and move between conversations using spatial audio, so the space stays open between scheduled calls rather than existing only for the length of a meeting.

Accurate conversion depends on the date more than the cities. Daylight saving moves the offset between two regions several times a year, so a calculation that holds in July can be an hour out in November. Use city names, not countries, since big countries span several zones. Check whether the converted time lands on a different day. And re-check recurring meetings after every clock change, because a standing call that worked all summer can land an hour off with nobody touching the invite.