Time Zone Converter: Time Between Cities & Zones Online
Time zone converter online: convert time between cities and 28 time zones with DST support, and compare UTC offsets instantly.
Updated 2026-08-26
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Features
- Convert time between different time zones and cities worldwide
- Support for 28 time zones including UTC, GMT, EST, CST, PST, CET, JST, and more
- Daylight Saving Time (DST) support for applicable time zones
- 12-hour and 24-hour time format options
- Shows day difference (+1 day, -1 day) when conversion crosses midnight
- Clear city names and time zone abbreviations for easy identification
- Automatic time offset calculation between source and target zones
- Instant bidirectional conversion: swap source and target with one click
- Works offline after first load
How to Use
- 1Enter the time in the input field (hour and minute).
- 2Select the source time zone (where the time is from).
- 3Select the target time zone (where you want to convert to).
- 4Toggle DST (Daylight Saving Time) if applicable.
- 5Switch between 12-hour and 24-hour format using the toggle.
- 6Use the swap button to reverse the conversion direction immediately.
- 7Check the day indicator to see if the result is same day, next day (+1), or previous day (-1).
- 8Verify meeting times by converting from your local time zone to all participants' time zones one by one.
Frequently Asked Questions
What time zones are supported?
28 time zones including UTC, GMT, EST (New York), CST (Chicago), PST (Los Angeles), CET (Paris), MSK (Moscow), IST (Mumbai), CST (Beijing), JST (Tokyo), SGT (Singapore), AEST (Sydney), NZST (Auckland), and more. Each zone shows the major city it represents.
How does Daylight Saving Time work?
Toggle the DST option to apply daylight saving time adjustments. Not all time zones use DST. For example, EST becomes EDT (UTC-4) during DST, while JST (Japan) does not observe DST. The tool automatically shows the correct offset when DST is enabled.
What does '+1 day' or '-1 day' mean?
When the converted time crosses midnight, the tool shows the day difference. '+1 day' means the result is on the next day, '-1 day' means the previous day. This is essential for scheduling meetings that span multiple days.
Should I use 12-hour or 24-hour format?
Use 24-hour format (14:00) for international business and military contexts. Use 12-hour format (2:00 PM) for casual use or when communicating with people in regions that prefer it (like the US). Both formats are supported.
How do I convert EST to IST?
Pick New York (EST/EDT) as the source and Mumbai (IST, UTC+5:30) as the target. In winter New York is EST (UTC-5): 9:00 AM EST = 7:30 PM IST. In summer it is EDT (UTC-4): 9:00 AM = 6:30 PM IST. The one-hour swing is daylight saving; make sure the DST toggle matches the date you are converting.
Why does my result differ from Google's time zone converter?
For the current date both should agree. Differences appear when converting a date that crosses a DST transition: if one side applies DST and the other does not (or uses today's offset for a future date), the results are an hour apart. Check the DST toggle here, and on the other side check what date it assumes; then convert with matching settings.
Why is my city not in the time zone list?
The list covers 28 major cities and their standard time zones, but it cannot include every city. If yours is missing, pick the time zone of its country or a nearby major city; both show the same UTC offset as long as they share the same standard time and DST rules.
Why is my conversion off by one hour?
The usual cause is Daylight Saving Time. New York is UTC-5 in winter (EST) and UTC-4 in summer (EDT): if DST is off for a summer date, the result is 1 hour early. Turn the DST toggle on and re-check. Zones without DST (Tokyo, Beijing, Mumbai) never shift.
How do I schedule a recurring meeting across time zones?
Convert the meeting time for each participant's time zone. Remember that DST transitions can change the offset between time zones; a meeting that works today might shift by an hour after a DST change. Check the conversion again after DST transitions to ensure the time still works for everyone.
Why do some time zones have a 30-minute or 45-minute offset?
Not all time zones use full hour offsets. India (IST) is UTC+5:30, Nepal is UTC+5:45, and parts of Australia have UTC+9:30 and UTC+10:30. These fractional offsets are historical and political decisions. The converter handles all standard fractional-hour time zones correctly.
What does UTC stand for and why is it used as a reference?
UTC stands for Coordinated Universal Time. It is the primary time standard by which the world regulates clocks and time. It replaced GMT (Greenwich Mean Time) as the international standard in 1972. UTC uses atomic time for precision and is adjusted with leap seconds to stay aligned with Earth's rotation.
How do I handle time zone conversion for a team across 4+ time zones?
Pick a reference time zone (often UTC or your own) and convert to each participant's zone one at a time. Look for common working hours overlap. For distributed teams, consider establishing shared core hours (e.g., 2-3 hours where everyone is available) and rotate meeting times to share the inconvenience of early/late calls.