Editing Clock (section)

====Digital====

{{Main|Digital clock}}

<gallery mode="packed-hover" heights="150px" caption="Examples of digital clocks">
Kanazawa Station Water Clock.jpg|Digital clock<!-- outside [[Kanazawa Station]]--> displaying time by controlling valves on the fountain
Digital-clock-radio-basic hf.jpg|Simplistic digital clock radio
Analog clock with digital display.png|Diagram of a mechanical digital display of a [[flip clock]]
Cifra 5 digital flip clock designed by Gino Valle (1957).jpg|Cifra 5 digital flip clock (1957)
SAMSUNG Galaxy S22 Ultra BLACK.jpg|A digital clock on a [[Samsung Galaxy]] smartphone
</gallery>

Digital clocks display a numeric representation of time. Two numeric display formats are commonly used on [[Digital data|digital]] clocks:
* the [[24-hour notation]] with hours ranging 00–23;
* the [[12-hour notation]] with AM/PM indicator, with hours indicated as 12AM, followed by 1AM–11AM, followed by 12PM, followed by 1PM–11PM (a notation mostly used in domestic environments).

Most digital clocks use electronic mechanisms and [[LCD]], [[LED]], or [[vacuum fluorescent display|VFD]] displays; many other display technologies are used as well ([[cathode-ray tube]]s, [[nixie tube]]s, etc.). After a reset, battery change or power failure, these clocks without a backup battery or [[capacitor]] either start counting from 12:00, or stay at 12:00, often with blinking digits indicating that the time needs to be set. Some newer clocks will reset themselves based on radio or Internet [[time server]]s that are tuned to national [[atomic clock]]s. Since the introduction of digital clocks in the 1960s, there has been a notable decline in the use of analog clocks.<ref>{{cite book |last1=Sadraey |first1=Mohammad H. |title=Design of Unmanned Aerial Systems |date=2020 |publisher=John Wiley & Sons |isbn=978-1-119-50870-0 |page=332}}</ref>

Some clocks, called '[[flip clock]]s', have digital displays that work mechanically. The digits are painted on sheets of material which are mounted like the pages of a book. Once a minute, a page is turned over to reveal the next digit. These displays are usually easier to read in brightly lit conditions than LCDs or LEDs. Also, they do not go back to 12:00 after a power interruption. Flip clocks generally do not have electronic mechanisms. Usually, they are driven by [[Alternating current|AC]]-[[synchronous motor]]s.