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| | The COOLroom.org - Understanding Greenwich Mean Time |
 | | This makes it very confusing for machines like computers to determine which hour it really is. So, many large scale systems use the 24-hour clock, sometimes called "military time." In the 24-hour time system, Midnight is represented by 00:00, 1:00 AM by 01:00, and so on. |
 | | Notice that in the 24-hour time system there is no need for AM or PM. |
 | | Thus, in the winter, you will need to subtract 5 hours from the timestamp to determine the time in Eastern Standard Time (EST) that the data is from, and in the summer you will need to subtract 4 hours to obtain Eastern Daylight Time (EDT). |
| www.thecoolroom.org /education/gmt.htm (602 words) |
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