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What is UTC?

Scientific convention dictates that data collected for global dissemination be referenced to the internationally recognized Universal Time Coordinate (UTC).  UTC, also referred to as Zulu (Z) or Greenwich Mean Time (GMT),  is referenced to a clock in Greenwich, England.

As of 11:41p.m. CST on October 4, 2003 users of data displayed on the LUMCON Monitoring System web site will be given the option of displaying graphic data in either local time (CST or CDT) or the UTC standard . Tabular data on the leader page for each station, as in the past,  will be viewed in local time (CST or CDT) only. 

UTC uses a 24-hour clock instead of a 12-hour clock. For example 1:00 a.m. is expressed as 0100 UTC and 1:00 p.m. is expressed as 1300 UTC.

To convert UTC to local time in the US Central Time Zone (where LUMCON is located), subtract 6 hours from UTC for times between  2 a.m. CST on the first Sunday in October and 2 a.m. CST on the first Sunday in April. For all other times of the year subtract 5 hours from UTC to get CDT.

To convert UTC to local time (Central Time), subtract 6 hours from UTC or five hours for convert from Central Daylight time. The table below shows North American conversion factors:

Local Time

Subtract from UTC:

Atlantic Standard Four hours
Atlantic Daylight Three hours
Eastern Standard Five hours
Eastern Daylight Four hours
Central Standard Six hours
Central Daylight Five hours
Mountain Standard Seven hours
Mountain Daylight Six hours
Pacific Standard Eight hours
Pacific Daylight Seven hours
Alaskan Standard Nine hours
Alaskan Daylight Eight hours
Hawaiian Standard Ten hours


For more information:

The National Data Buoy Center's Explanation

The Navy's Explanation

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