Mountain Time Zone is generically called Mountain Time (MT). Specifically, it is Mountain Standard Time (MST) when observing standard time, and Mountain Daylight Time (MDT) when observing daylight saving time. The term refers to how the Rocky Mountains, which range from northwestern Canada to the US state of New Mexico, are located almost entirely in the time zone. In Mexico, this time zone is known as the Zona Pacífico (Pacific Zone). In the US and Canada, the Mountain Time Zone is to the east of the Pacific Time Zone and to the west of the Central Time Zone. In some areas, starting in
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