The article explores the historical roots and practical applications of the 12-hour and 24-hour time formats. Originating from ancient Egypt and Babylonia respectively, these systems offer distinct ...

The Navy was the first branch of the U.S. military to embrace the 24-hour clock in 1920. It may be hard to believe, but the U.S. Army didn't start using military time until 0400 on July 1, 1942.