Time Zone Converter — Convert Time Between Time Zones
Convert any date and time between world time zones instantly. See also Military Time Converter and Countdown Timer.
Current Time in Major Cities
| City | Time Zone | Current Time (12h) | Current Time (24h) | UTC Offset |
|---|---|---|---|---|
| UTC | UTC | 11:51:14 AM | 11:51:14 | UTC+0 |
| New York | America/New_York | 7:51:14 AM | 07:51:14 | UTC-4 |
| Chicago | America/Chicago | 6:51:14 AM | 06:51:14 | UTC-5 |
| Denver | America/Denver | 5:51:14 AM | 05:51:14 | UTC-6 |
| Los Angeles | America/Los_Angeles | 4:51:14 AM | 04:51:14 | UTC-7 |
| London | Europe/London | 12:51:14 PM | 12:51:14 | UTC+1 |
| Paris | Europe/Paris | 1:51:14 PM | 13:51:14 | UTC+2 |
| Berlin | Europe/Berlin | 1:51:14 PM | 13:51:14 | UTC+2 |
| Tokyo | Asia/Tokyo | 8:51:14 PM | 20:51:14 | UTC+9 |
| Shanghai | Asia/Shanghai | 7:51:14 PM | 19:51:14 | UTC+8 |
| Kolkata | Asia/Kolkata | 5:21:14 PM | 17:21:14 | UTC+5.5 |
| Dubai | Asia/Dubai | 3:51:14 PM | 15:51:14 | UTC+4 |
| Sydney | Australia/Sydney | 9:51:14 PM | 21:51:14 | UTC+10 |
| Auckland | Pacific/Auckland | 11:51:14 PM | 23:51:14 | UTC+12 |
How the Time Zone Converter Works
The Time Zone Converter calculates the equivalent time in a target time zone by determining the UTC offset difference between the source and destination zones. Each time zone is defined as an offset from Coordinated Universal Time (UTC), formerly known as Greenwich Mean Time (GMT). The converter accounts for the current offset including any Daylight Saving Time (DST) adjustments that may be in effect.
Time Zone Conversion Formula
Target Time = Source Time + (Target UTC Offset - Source UTC Offset)
Example: 3:00 PM UTC to EST (UTC-5)
Target Time = 15:00 + (-5 - 0) = 10:00 AM EST
Understanding UTC and GMT
UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks and time. It is effectively the successor to GMT (Greenwich Mean Time) and is used as the reference point for all time zones. UTC does not observe daylight saving time, making it a stable reference for time conversions. Time zones are expressed as positive or negative offsets from UTC — for example, Eastern Standard Time (EST) is UTC-5, meaning it is 5 hours behind UTC.
Daylight Saving Time (DST)
Many time zones observe Daylight Saving Time, shifting clocks forward by one hour in spring and back in fall. This means the UTC offset for a given time zone can change throughout the year. For example, Eastern Time is UTC-5 during standard time (EST) but UTC-4 during daylight saving time (EDT). Not all regions observe DST — Arizona (US), most of Asia, Africa, and South America do not change their clocks. This converter uses the Intl API which automatically accounts for DST based on the date you select.
Frequently Asked Questions
What is the difference between UTC and GMT?
UTC and GMT represent essentially the same time (zero offset), but UTC is the modern scientific standard based on atomic clocks, while GMT is the older astronomical standard based on solar time at the Royal Observatory in Greenwich, England. For practical purposes, they are interchangeable.
Does this converter handle Daylight Saving Time?
Yes. The converter uses the JavaScript Internationalization API which automatically applies DST rules based on the date and time zone you select. If a zone is currently observing DST, the offset will reflect that.
Why do some time zones have 30 or 45 minute offsets?
While most time zones are offset by whole hours from UTC, some regions use half-hour (UTC+5:30 for India) or 45-minute offsets (UTC+5:45 for Nepal). These were established based on geographic and political considerations.
How many time zones are there in the world?
There are 38 distinct time zones in use worldwide, ranging from UTC-12 to UTC+14. Some zones share the same offset but have different DST rules, resulting in over 400 named time zone identifiers in the IANA database.
What is the International Date Line?
The International Date Line (IDL) is an imaginary line running roughly along the 180th meridian in the Pacific Ocean. When you cross it going west, you advance one calendar day; going east, you go back one day. This is why converting between zones on opposite sides of the IDL can result in a different date.
How do I convert time for a conference call across multiple zones?
Enter the proposed meeting time in your local time zone as the source, then convert to each participant's time zone one at a time. Look for a time that falls within normal business hours (9 AM - 6 PM) for all participants.
Why does the converted time show "Next day" or "Previous day"?
When the time difference between zones is large enough, the converted time may fall on a different calendar day. For example, 11 PM in New York is 4 AM the next day in London (during EST). The day relation indicator helps you understand this date shift.