UT is an Abbreviation for Universal Time

UT is used as a basis for calculating time throughout most of the world. UT is also called Greenwich Time, Greenwich Mean Time, Zulu Time. It is the time along the prime meridian (0 longitude) that runs through the Greenwich Observatory outside of London, UK, where the current system originated.

UT is tied to the rotation of the Earth in respect to the fictitious "mean Sun," which gives equal 24-hour days throughout the year. Greenwich Mean Time (GMT) was measured from Greenwich Mean at midday until 1925, when the reference point was changed from noon to midnight and the name changed to "Universal Time."

UT, GMT and UTC can be used interchangeably (*)


Using the Table Below

UT conversion is fairly easy. Just add a specified number of hours to UT time to determine your time. All you need to know is your time zone and if / when your state or country enforces Daylight Saving Time. If it does, you add an additional hour to Universal Time during that time of the year. Worldwide Daylight Saving Time


Click here for printable time conversion chart.

Take UT and Add
the following to determine your time:

Time Zone


Daylight Saving
& Summer Time

Chatham Islands (CHAST) (CHADT) +12.75 hrs +13.75 hrs 
International Date Line East (IDLE) +12 hours  
New Zealand Standard Time (NZST) (NZDT) +12 hours +13 hours 
Guam Standard Time (GST) +10 hours  
Australian Eastern Standard Time (AEST)
+10 hours +11 hours
Australian Central Standard Time (ACST)
+9.5 hours +10.5 hours
Japan Standard Time (JST) +9 hours  
China Coast Time (CCT) +8 hours  
Australian Western Standard Time (AWST) +8 hours  
India Standard Time (IST) +5.5 hours  
Russian Zone 3 +4 hours  
Baghdad Time (BT) +3 hours  
Russian Zone 2 +3 hours  
Moscow Time(MSK)
+3 hours +4 hours
Eastern European Time (EET)
+2 hours +3 hours
Russian Zone 1 +2 hours  
Central Europe Summer Time (CEST)
+2 hours
Central European Time (CET) +1 hour  
Middle European Time (MET) +1 hour  
Swedish Winter Time (SWT)  0 hours  
Greenwich Mean Time (GMT)  0 hours  
Universal Time (UT)  0 hours  
Western European Time (WET)
 0 hours +1 hour
British Summer Time (BST) +1 hour 
Irish Summer Time (IST) +1 hour 
West African Time (WAT) -1 hour  
Newfoundland Standard Time (NST)
-3.5 hours -2.5 hours
Atlantic Standard Time (AST)
-4 hours -3 hours
Eastern Standard Time (EST)
-5 hours -4 hours

Central Standard Time (CST)

-6 hours -5 hours
Mountain Standard Time (MST)
-7 hours -6 hours
Pacific Standard Time (PST)
-8 hours -7 hours
Alaskan Standard Time (AKST)
-9 hours -8 hours
Hawaiian Standard Time (HST) -10 hours  
International Date Line West (IDLW) -12 hours  


Time Zone Converter
If it's 3:00pm in New York, what time is it in Sydney?
Time Zone Converter for the Sight Impaired
WCAG 2.0 compatible

Explore Worldwide Time Zone Abbreviations.

Here's a really cool Time Zone Map.

For U.S. time zone conversions:

Learn all about Daylight Saving Time.

This is a wonderful and useful Time and Date Site.
Annual + Moon Calendars, Holidays, World Clock
Sun: Rise+Set Times (See Moon Calendar.)
Global Sunrise Sunset Times


There are three separate definitions, UT0, UT1, and UT2, depending on which corrections have been applied to the Earth's motion. Coordinated Universal Time (UTC) also known as Civil Time is kept within 0.9 seconds of UT1, by the addition of leap seconds to International Atomic Time (TAI). TAI is based on atomic clocks. The last leap second added to UTC was on December 31, 1998 at 23:59:60 UTC (the last minute of 1998 had one extra second). There will be no leap second in June 2003 but may be in December 2003, it will not be decided until July 2003! UT, GMT and UTC differ negligibly; therefore, they are used and can be used interchangeably without ill effect.
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