PHP timezone. Where is my city?

Aparently, PHP doesn't recognize the State of Utah because I can't find the timezone for that area. Can someone please tell me what to use?" My 开发者_C百科server is in Salt Lake City.

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Mountain Time UTC-7 UTC-6 MST MDT America/Denver

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Mountain: UTC-7/-6 according to Wikipedia.

But it sounds like you have a different problem. At what point is PHP not recognizing the location, and what error messages come up?

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According to the Wikipedia page on the Zoneinfo database (aka the Olson database):

Usually the most populous city in a region is chosen to represent the entire time zone, although other cities may be selected if they are more widely known or result in a less ambiguous name.

As jspcal points out, the Zoneinfo name for Mountain Time is America/Denver.