Central Time Zone Wikipedia
U.S. territories also use additional time zones, including Atlantic Standard Time (AST, UTC−4, no DST) in Puerto Rico and the U.S. Central Standard Time (CST) is observed during winter, and Central Daylight Time (CDT) during daylight saving time in spring, summer, and autumn — some areas within the zone keep standard time year-round instead. Offsets and mainland scheduling notes are in What Time Zones do U.S. territories use? Hawaii does not observe DST, so it is about five hours behind Eastern in winter and six hours behind in summer.
For three or more cities, use the World Meeting Planner. A Pacific-to-Arizona conversion therefore depends on the season; Colorado 7Reels Casino 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.
Both coasts change clocks on the same federal DST dates, so the gap stays three hours in winter (EST vs PST) and in summer (EDT vs PDT). For mainland multi-city mixes use the World Meeting Planner with named cities rather than a single “U.S. Hawaii runs five hours behind Eastern in winter and six in summer, because only the Eastern side changes clocks. The mainland graphic is a static map image of the four primary time zones; it is not interactive and does not show county-level boundaries. Quick links to convert between mainland U.S. time zones. The same eight time zones from the comparison above, organized by UTC offset instead of by name — useful for seeing which zones share a clock time once daylight saving time shifts them.
