Arizona Time (MST) to Eastern, Central and Pacific
MST here is Arizona time (America/Phoenix, UTC-7 year-round). Against Eastern: add two hours in winter, three when Eastern is on EDT.
Central and Pacific are on this page too. Central is +1 in winter and +2 in summer; Pacific is -1 in winter and the same clock in summer.
Pick a date before booking—Arizona never springs forward, so every seasonal change comes from the other zone moving.
Need a different city or zone? Time Zone Converter · U.S. Time Zones · Meeting Planner
Mountain Standard Time
Eastern Daylight Time
Target date updates the zone cards and grid below. The live comparison above always shows current time.
Mountain Standard Time
Eastern Daylight Time
About Arizona time and Eastern Time
Arizona time (MST) on this page follows America/Phoenix and covers places such as Phoenix, Tucson, Flagstaff; it stays on UTC-7 year-round. Eastern Time (ET) covers places such as New York, Toronto, Miami; it uses EST in winter and EDT in summer.
Arizona time is 2 hours behind Eastern Time in winter and 3 hours behind when Eastern observes daylight saving time; confirm the selected date above for the exact gap. During daylight saving time, Eastern Time regions that observe DST switch from EST to EDT. MST on this page means Arizona time (America/Phoenix), which does not switch to MDT and is not Denver Mountain Time. Use the live clocks, slider, and grid above to confirm the exact local times for your date.
MST to EST Hour-by-Hour Conversion Grid
Hour-by-hour Mountain Standard Time (MST) to Eastern Standard Time (EST) for the selected date.
| Mountain Standard Time (MST) | Eastern Standard Time (EST) | Status & Overlap Time |
|---|---|---|
| 12:00 AM (Midnight) | 3:00 AM | Non-overlapping hours |
| 1:00 AM | 4:00 AM | Non-overlapping hours |
| 2:00 AM | 5:00 AM | Non-overlapping hours |
| 3:00 AM | 6:00 AM | Non-overlapping hours |
| 4:00 AM | 7:00 AM | Non-overlapping hours |
| 5:00 AM | 8:00 AM | Non-overlapping hours |
| 6:00 AM | 9:00 AM | Non-overlapping hours |
| 7:00 AM | 10:00 AM | Non-overlapping hours |
| 8:00 AM | 11:00 AM | Non-overlapping hours |
| 9:00 AM | 12:00 PM (Noon) | Working Hour Overlap |
| 10:00 AM | 1:00 PM | Working Hour Overlap |
| 11:00 AM | 2:00 PM | Working Hour Overlap |
| 12:00 PM (Noon) | 3:00 PM | Working Hour Overlap |
| 1:00 PM | 4:00 PM | Working Hour Overlap |
| 2:00 PM | 5:00 PM | Working Hour Overlap |
| 3:00 PM | 6:00 PM | Non-overlapping hours |
| 4:00 PM | 7:00 PM | Non-overlapping hours |
| 5:00 PM | 8:00 PM | Non-overlapping hours |
| 6:00 PM | 9:00 PM | Non-overlapping hours |
| 7:00 PM | 10:00 PM | Non-overlapping hours |
| 8:00 PM | 11:00 PM | Non-overlapping hours |
| 9:00 PM | 12:00 AM (Midnight) · Thu, Aug 27 | Non-overlapping hours |
| 10:00 PM | 1:00 AM · Thu, Aug 27 | Non-overlapping hours |
| 11:00 PM | 2:00 AM · Thu, Aug 27 | Non-overlapping hours |
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Arizona is the zone that never moves — everyone else does
On this page MST is Arizona time (America/Phoenix). Phoenix, Tucson, Mesa, and Flagstaff sit at UTC−7 all year and never observe daylight saving. Every other U.S. mainland zone does. That single asymmetry is why Arizona cannot be memorised as a fixed offset: the gap to Eastern, Central, and Pacific each changes twice a year without Arizona’s own clock moving at all.
The table below is the whole page in one glance. Pick the date before booking anything.
Arizona against all three zones
| Target zone | Winter (others on standard time) | Summer (others on daylight time) |
|---|---|---|
| Eastern (New York, Atlanta, Miami) | +2 (EST) | +3 (EDT) |
| Central (Chicago, Houston, Dallas) | +1 (CST) | +2 (CDT) |
| Pacific (Los Angeles, Seattle) | −1 (PST) | 0 — same clock (PDT) |
The Pacific row is the one that surprises people. For roughly eight months of the year Phoenix and Los Angeles show the same time, then in November Phoenix moves an hour ahead of Los Angeles without changing its own clock.
Eastern: two hours in winter, three in summer
When Eastern is on EST, 10:00 AM Phoenix is 12:00 PM New York. When Eastern is on EDT, the same Phoenix clock reads 1:00 PM New York.
- 8:00 AM Arizona = 10:00 AM EST / 11:00 AM EDT
- 3:00 PM Arizona = 5:00 PM EST / 6:00 PM EDT
- 6:00 PM Arizona = 8:00 PM EST / 9:00 PM EDT
Eastern springs forward on the second Sunday in March and falls back on the first Sunday in November. Arizona does neither, so the gap flips on those two weekends.
Central: one hour in winter, two in summer
Chicago is the closest of the three and the easiest to get wrong, because a one-hour gap looks small enough to guess. 9:00 AM Phoenix is 10:00 AM Chicago in January and 11:00 AM Chicago in July. A recurring 9:00 AM Arizona standup silently moves an hour in the Chicago calendar every spring unless the invite carries a named zone.
Pacific: identical in summer, one hour apart in winter
From March to November, Phoenix and Los Angeles read the same clock — Arizona at UTC−7 and Pacific on PDT at UTC−7. From November to March, Pacific drops to PST (UTC−8) and Phoenix is one hour ahead. Teams split between the two cities usually discover this in November, when a call that never needed converting suddenly does.
Denver is Mountain Time, not Arizona time
Denver, Salt Lake City, and Albuquerque are on Mountain Time with daylight saving (MDT, UTC−6 in summer). In winter they match Phoenix exactly; in summer they run one hour ahead of it. So “Mountain Time” on an invite is ambiguous in summer and harmless in winter — the opposite of most zone confusion. The Navajo Nation observes DST while the Hopi Reservation inside it does not; the details are in Why Arizona ignores DST.
How to schedule so this never bites
Write invites with IANA zone names — America/Phoenix against America/New_York, America/Chicago, or America/Los_Angeles — rather than a hard-coded “+2” or the bare label “Mountain.” For a specific date, use the slider above; for three or more cities at once, use the World Meeting Planner.
Related pages
Why Arizona ignores DST · CST to EST · PST to EST · U.S. DST 2026 · Time Zone Converter
Arizona Time (MST) FAQ
MST here is Arizona time (America/Phoenix, UTC-7 year-round). Because Arizona never changes clocks, its gap to Eastern, Central, and Pacific each shifts twice a year on its own.
How many hours should Phoenix add to reach New York—and why does July differ from January?
In winter (Eastern on EST), add 2 hours. When Eastern is on EDT, add 3 hours. Arizona on this page stays on UTC−7 year-round (America/Phoenix) while Eastern moves. Example: 10:00 AM Phoenix is 12:00 PM Eastern in winter or 1:00 PM Eastern in summer.
What is the gap from Arizona to Central and Pacific?
Central is +1 hour in winter and +2 in summer. Pacific is −1 hour in winter and the same clock in summer, because Arizona (UTC−7) and PDT (UTC−7) match. Phoenix and Los Angeles read identically from March to November, then diverge by an hour.
Is MST on this page Arizona time or Denver time?
Arizona time (Phoenix) only—fixed UTC−7. Denver, Salt Lake City, and Albuquerque use Mountain Time with DST, so they match Phoenix in winter but run one hour ahead in summer. Background: Why Arizona ignores DST.
Which side changes clocks for daylight saving?
Never Arizona. Eastern, Central, and Pacific all spring forward and fall back; Phoenix does not. Every seasonal change on this page comes from the other zone moving, which is why no fixed offset works year-round.
What Phoenix morning hours land in Eastern late morning or afternoon?
Phoenix 9:00–11:00 AM maps to late morning Eastern in winter and early-to-mid afternoon Eastern in summer. Set invites with America/Phoenix and America/New_York, not a hard-coded “+2.”
Which cities are covered here?
Arizona: Phoenix, Tucson, Scottsdale, Flagstaff. Eastern: New York, Washington, D.C., Miami, Toronto. Central: Chicago, Houston, Dallas. Pacific: Los Angeles, Seattle, Vancouver.
Does the Navajo Nation follow this Phoenix rule?
Most of Arizona, including Phoenix and Tucson, stays on UTC−7. The Navajo Nation observes U.S. DST and can align with MDT in summer, while the Hopi Reservation inside it does not. This page follows Phoenix. Details: Arizona DST guide.
How do I convert in the other direction, Eastern into Arizona?
Reverse the sign on the same numbers: subtract 2 hours from EST or 3 hours from EDT. A 9:30 AM Eastern market open is 7:30 AM Phoenix in winter and 6:30 AM Phoenix in summer. The slider above works in both directions.