Time display
The time display is the locally visible digital or analog or numerical or word number in the display of the respective time zone valid time . The display is done indirectly by local timers, e.g. B. by means of a wristwatch with analog or digital time display, the time stored in the CMOS or by time signals from reference clocks such as the atomic clock of the Physikalisch Technische Bundesanstalt (PTB) in Braunschweig, which can be accessed by radio clocks if there is no mains connection .
The legal time reference is an electronic clock comparison with sufficient accuracy for the synchronization of networks such. B. Provider offers just as necessary as for timetables of public transport systems, for the connection of telephone and radio broadcasts as well as for route planning or the alarm signal and the timer or other time-critical private applications.
For browsers such as Firefox , plug-ins with a numeric display are offered which, even in online operation, only use the CMOS time, but not the reference time. An alternative to this is the time display at the University of Cologne.
For time-based automatic device control, real-time clocks make it possible to dispense with the visibility of the time cycle. The so-called Internet time (RFC) applies globally on the Internet .
Web links
Individual evidence
- ^ Helmut Kahlert , Richard Mühe , Gisbert L. Brunner , Christian Pfeiffer-Belli: wrist watches: 100 years of development history. Callwey, Munich 1983; 5th edition, ibid. 1996, ISBN 3-7667-1241-1 , p. 504 ( analog time measurement and digital time display ).