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The scheduling of television programming in North America (namely the United States, Canada, and Mexico) must cope with different time zones. The United States (excluding territories) has six time zones ( Hawaii–Aleutian, Alaska, Pacific, Mountain, Central and Eastern ), with further variation in the observance of daylight saving time.
FM broadcast zones in the U.S. The U.S. is divided into Zone I (roughly the northeastern quarter of the U.S. mainland, excluding the far northern areas), Zone I-A (California south of 40 degrees latitude, U.S. Virgin Islands, Puerto Rico), and Zone II (all other locations). The highest-power stations are class C in zone II, and class B in the ...
Radio-controlled clocks can then apply time zone and daylight saving time offsets as needed to display local time. [3] The time used in the broadcast is set by the NIST Time Scale, known as UTC(NIST). This time scale is the calculated average time of an ensemble of master clocks, themselves calibrated by the NIST-F1 and NIST-F2 cesium fountain ...
WWV is a shortwave ("high frequency" or HF) radio station, located near Fort Collins, Colorado. It has broadcast a continuous time signal since 1945, and implements United States government frequency standards, with transmitters operating on 2.5, 5, 10, 15, and 20 MHz. [ 1] WWV is operated by the U.S. National Institute of Standards and ...
Dayparting. Approximate U.S. television broadcast dayparts for weekdays ( Eastern Time Zone ). In broadcast programming, dayparting is the practice of dividing the broadcast day into several parts, in which a different type of radio programming or television show appropriate for that time period is aired. Television programs are most often ...
Affiliates in the Mountain, Alaskan, and Hawaiian zones are either on their own to delay broadcast by an hour or two, or collectively form a small, regional network feed with others in the same time zone. Prime time is commonly defined as 8:00–11:00 p.m. Eastern/Pacific and 7:00–10:00 p.m. Central/Mountain.
Time in the United States. In the United States, time is divided into nine standard time zones covering the states, territories and other US possessions, with most of the country observing daylight saving time (DST) for approximately the spring, summer, and fall months. The time zone boundaries and DST observance are regulated by the Department ...
In 1968, however, Time Life Broadcasting led and won a federal lawsuit for the observance of DST. Following, the assembly placed northwest and southwest Indiana in the Central Time Zone and the rest of the state on Eastern Time. [67] From 1970 until 2006, most of Indiana in the Eastern Time Zone did not observe daylight saving time, but the ...