Effects of time zones on North American broadcasting Effects of time zones on North American broadcasting 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. Canadian
The Standard Hour series. A tradition of more than 30 years began with the first broadcast on the NBC Pacific Network, on October 24, 1926. "Though it was heard only on a partial network," wrote radio historian John Dunning, ""The Standard Hour" was a major musical series that spanned the entire length of network broadcasting." A 1943 brochure shows that the programs were carried on KPO in San Francisco, KFI in Los Angeles, KMJ in Fresno, KGW in Portland, Oregon, KOMO in Seattle, Washington, and KHQ in Spokane, Washington. The Sunday-evening series was ultimately heard in Hawaii and Alaska. The theme music for