(Match the time bar color to the map color at the bottom)

UTC at Greenwich, England

FJT + 12 hours from UTC FJST + 13 hours from UTC Fiji

TOT + 13 hours from UTC Tonga

SST - 11 hours from UTC WST - 10 hours from UTC American Samoa

HAST - 10 hours from UTC Hawaii Timezone Abbreviations FJT Fuji Time

Fuji Time HAST Hawaii Standard Time

Hawaii Standard Time TOT Tonga Time

Tonga Time SST Samoa Time

Samoa Time DST Daylight Savings Time

International Dateline

The International Date Line sits on the 180º line of longitude in the middle of the Pacific Ocean, and is the imaginary line that separates two consecutive calendar days. It is not a perfectly straight line and has been moved slightly over the years to accommodate needs (or requests) of varied countries in the Pacific Ocean. Note how it bends to include all of Kiribati, Samoa, Tonga and Tokelau in the Eastern Hemisphere.

Immediately to the left of the International Date Line, the date is always one day ahead of the date (or day) immediately to the right of the International Date Line in the Western Hemisphere.

On the time and date codes shown below, note that Tonga and American Samoa have the same time but are one day apart, as American Samoa is in the Western Hemisphere, on the opposite side of the International Dateline from Tonga. A global Earth view can be found here.

As you travel further west, note that the time in Fiji is one hour earlier than Tonga. You will also notice that Hawaii, further to the east of American Samoa, is one hour later in time.

So, travel east across the International Date Line results in a day, or 24 hours, being subtracted. Travel west across the International Date Line results in a day being added.

UTC and GMT an update

The worldwide standard for coordinated universal time, formerly known as GMT (Greenwich Mean Time), is now abbreviated as UTC (Coordinated Universal Time).

Some sources still refer to it as UTC/GMT and some web browsers, e.g. Mozilla Firefox, still display it as GMT.

The UTC Time (shown directly below) is the standard time zone upon which all other worldwide time zones are based. It never observes daylight saving time.