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2. 24-hour clock - Wikipedia

   en.wikipedia.org/wiki/24-hour_clock

   24-hour digital clock in Miaoli HSR station.. A time of day is written in the 24-hour notation in the form hh:mm (for example 01:23) or hh:mm:ss (for example, 01:23:45), where hh (00 to 23) is the number of full hours that have passed since midnight, mm (00 to 59) is the number of full minutes that have passed since the last full hour, and ss (00 to 59) is the number of seconds since the last ...

3. Doomsday Clock - Wikipedia

   en.wikipedia.org/wiki/Doomsday_Clock

   It has since been set backward 8 times and forward 17 times. The farthest time from midnight was 17 minutes in 1991, and the nearest is 90 seconds, set in January 2023. The Clock was moved to 150 seconds (2 minutes, 30 seconds) in 2017, then forward to 2 minutes to midnight in January 2018, and left unchanged in 2019. [5]

4. Timer - Wikipedia

   en.wikipedia.org/wiki/Timer

   A typical kitchen timer. A timer or countdown timer is a type of clock that starts from a specified time duration and stops upon reaching 00:00. An example of a simple timer is an hourglass. Commonly, a timer triggers an alarm when it ends. A timer can be implemented through hardware or software.

5. Decimal time - Wikipedia

   en.wikipedia.org/wiki/Decimal_time

   One décime is equal to 10 decimal minutes, which is nearly equal to a quarter-hour (15 minutes) in standard time. Thus, "five hours two décimes" equals 5.2 decimal hours, roughly 12:30 p.m. in standard time. [8] [9] One hundredth of a decimal second was a decimal tierce. [10]

6. Hexadecimal time - Wikipedia

   en.wikipedia.org/wiki/Hexadecimal_time

   A hexadecimal clock-face (using the Florence meridian) Hexadecimal time is the representation of the time of day as a hexadecimal number in the interval [0, 1). The day is divided into 10 16 (16 10) hexadecimal hours, each hour into 100 16 (256 10) hexadecimal minutes, and each minute into 10 16 (16 10) hexadecimal seconds.

7. 12-hour clock - Wikipedia

   en.wikipedia.org/wiki/12-hour_clock

   The 12-hour clock is a time convention in which the 24 hours of the ... 30 or 8:00. Such phrasing can be misinterpreted for a specific time of day (here 7:38 ...