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https://www.nist.gov/time-distribution/radio-station-wwv/wwv-and-wwvh-digital-time-code-and-broadcast-format
The hours are numbered beginning with 00 hours at midnight through 12 hours at noon to 23 hours and 59 minutes just before the next midnight. Standard Time Intervals The most frequent sounds heard on WWV and WWVH are the seconds pulses.
https://www.cbhours.com/about.php
Update 9-30-2018: CBHours will now hide any models that exceed 600 hours a month. It is physically impossible for a single model to broadcast that many hours per month and all of the models currently hidden were either broadcasting a recording or broadcasting an empty room.
https://www.nist.gov/pml/time-and-frequency-division/time-distribution/radio-station-wwv
Beginning November 15, 2021, WWV and WWVH will be broadcasting a test signal on minute 8 of each hour on WWV, and minute 48 on WWVH. This signal has been created to assist in ionospheric research, and is a joint effort of the Ham Radio Citizen Science Investigation (HamSCI) and NIST.
https://tf.nist.gov/stations/iform.html
Time announcements. Voice announcements are made from WWV once every minute. The …
https://en.wikipedia.org/wiki/Effects_of_time_zones_on_North_American_broadcasting
Local programming such as locally produced newscasts are not typically affected as many stations air their morning newscast at 4:00, 4:30, 5:00 or 5:30 a.m., and their early evening newscasts at 5:00 and/or 6:00 p.m.; however, the late evening newscast is affected due to the differences in time between time zones, meaning that if the late local news starts at 10:00 p.m. …
https://www.quora.com/When-did-24-hour-broadcasting-begin-on-TV-When-did-they-stop-playing-programming-at-night
As far as TV stations in other parts of the world are concerned, yes there are many that don’t broadcast 24 hours a day. It is quite common in smaller countries and developing nations for TV stations to go off-air around 11pm or midnight, and recommence broadcasting the next morning (or even afternoon in some cases).
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