In December 2009, the Mexican Congress allowed ten border cities, eight of which are in states that 7Reels Casino observe Central Time, to adopt the US daylight time schedule effective in 2010. At the time, Mexico decided not to go along with this change and observed their horario de verano («summer schedule») from the first Sunday in April to the last Sunday in October. In the United States, all time zones that observe DST were effectively changed by the Energy Policy Act of 2005. Although legally located within the Central Time Zone, Kenton, Oklahoma—located to the adjacent east of the defined border of the Central and Mountain time zones (at the Oklahoma−New Mexico state line)—unofficially observes Mountain Time.
For three or more cities, use the World Meeting Planner. A Pacific-to-Arizona conversion therefore depends on the season; Colorado summer clocks follow MDT, not this Arizona baseline. Denver and most Mountain Time Zone cities spring forward to Mountain Daylight Time (MDT), while most of Arizona stays on Mountain Standard Time (MST) year-round. Most of the state, including Phoenix, Tucson, and Mesa, stays on Mountain Standard Time (UTC−7) year-round and does not observe daylight saving.
The gap flips only when you compare an Indiana Eastern city with a place that does not change clocks—Arizona is the common mainland case—or when software maps a ZIP code to the wrong county zone. Most counties—including Indianapolis, Fort Wayne, Bloomington, and South Bend—use Eastern Time (America/Indiana/Indianapolis and related IANA zones) and observe the same March / November DST change as New York. Exceptions such as Arizona, Hawaii, and several territories are covered below. In everyday use, the United States has four primary zones—Eastern, Central, Mountain, and Pacific—plus Alaska and Hawaii, and separate zones for populated oversea territories.
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