Time conversions

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The World Meteorological Organization (WMO) has adopted Coordinated Universal Time (abbreviated UTC) as the standard time zone for use in reporting of all meteorological data. Based on the 0° longitude (Greenwich) meridian, it is determined using highly precise atomic clocks. GMT (Greenwich Mean Time) is an obsolete term. For practical purposes it is used today interchangeably with UTC.

To convert UTC to
Eastern Standard Time subtract 5 hours
Eastern Daylight Time subtract 4 hours
Atlantic Standard Time subtract 4 hours
Atlantic Daylight Time subtract 3 hours

The clocks below, linked to the U.S. Naval Observatory show the actual Eastern and UTC times.
Note: These clocks only work in Mozilla browsers. For a clock display supported by MS Internet Explorer click here...

	Eastern
	UTC

Times given in UTC and UT are usually in terms of a 24-hour clock. 13:20 (1320) would be 1:20 p.m. Sometimes a Z (for Zulu) is appended to a time to indicate UT, as in 1320Z.

12/24 hour clock converter: note: this clock uses your computer's time and constantly updates. It, therefore, may not agree with the clocks above.