<P> 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 . Canada also has six time zones (Pacific, Mountain, Central, Eastern, Atlantic and Newfoundland). Mexico has four time zones (Pacific, Mountain, Central, and Eastern). This requires broadcast and pay television networks in each country to shift programs in time to show them in different regions . </P> <P> Canadian 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 . 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 . </P> <P> Unlike in the United States, virtually all live events, including live entertainment shows and sports television, are simultaneously broadcast nationwide in Canada . For instance, live shows in Canada are aired to entirety at the same time in all time zones based on Eastern time . Several live U.S. shows are also aired simultaneously in all of Canada, including for viewers in the Pacific Coast (unlike in the United States where some viewers on the same side of the continent depend on tape - delayed broadcasts for some otherwise live events). Conversely, live shows aired in Canada are frequently televised simultaneously for some viewers in the U.S. with access to Canadian broadcast networks . </P> <P> The vast majority of specialty cable and satellite television channels in Canada each operate a single feed which is distributed in all time zones . This includes all French language channels, as they predominantly serve Francophone areas of the country, mostly in Quebec (almost all of which observes Eastern Time). Even many long - standing specialty channels with a general entertainment format use a single national feed, though in many cases they will repeat core primetime programming three hours after first broadcast, such that programs can be promoted as airing at the same time in both the Eastern and Pacific time zones . </P>

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