stations historically carried on television providers in their respective markets (such as Boston in Atlantic Canada, and Spokane in Alberta), meaning that stations may air certain programs out of pattern in comparison to other markets (such as airing a show scheduled at 8 p.m. This can affect how commercial broadcasters schedule their programming outside of Eastern, Central, and Pacific Time areas: the Atlantic and Mountain time zones are one hour ahead of the U.S. broadcast stations on local pay television to be 'substituted' with the Canadian station's signal if they are airing the same program. In order to protect local advertising revenue, the ' simsub' rules allow broadcast stations to require feeds of U.S. CBC Television and CTV created delay centres in Calgary in the early 1960s in order to allow programming to air in each time zone based on the region. In Canada Broadcast networks Ĭanadian broadcasting networks, with six time zones and a much larger percentage of its audience residing in the Mountain Time Zone than in the Central Time Zone, are sometimes able to avoid the issues that affect American programming by airing pre-recorded programs on local time.

This requires broadcast and pay television networks in each country to shift programs in time to show them in different regions. Mexico has four time zones (Pacific, Mountain, Central, and Eastern). Canada also has six time zones (Pacific, Mountain, Central, Eastern, Atlantic and Newfoundland). 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. The scheduling of television programming in North America (namely the United States, Canada, and Mexico) must cope with different time zones. Map of time zones in Canada and the United States. ( Learn how and when to remove this template message) JSTOR ( March 2011) ( Learn how and when to remove this template message).

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