12-hour clock: References & Edit History

Article Contributors

Primary Contributors

  • Daniel Costa
    Daniel Costa is a writer for Encyclopedia Britannica. He has studied applied linguistics, philosophy, and history.

Other Encyclopedia Britannica Contributors

Article History

Type Description Contributor Date
Add new Web site: Khan Academy - 12- and 24-hour time. Jul 15, 2026
Add new Web site: Journal of Engineering Research and Applications - Design, Implementation and Simulation of 12/24 Hours Digital Clock with Stop Watch and Date Indicator (PDF). May 09, 2025
Add new Web site: Journal of Engineering Research and Applications - Design, Implementation and Simulation of 12/24 Hours Digital Clock with Stop Watch and Date Indicator (PDF). Jul 15, 2024
Media added. Mar 03, 2023
Chart converting times from the 12-hour clock to the 24-hour clock added. Feb 28, 2023
New article added. Dec 16, 2022
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