Arizona to Eastern Time: the Short Answer
Eastern time is ahead of Arizona — by how much depends on the season, because the East Coast changes clocks and Arizona doesn't:
| Period | Difference | Example |
|---|---|---|
| Mid-March – early November (EDT) | Eastern is 3 hours ahead | 9:00 AM in Phoenix = Noon in New York |
| Early November – mid-March (EST) | Eastern is 2 hours ahead | 9:00 AM in Phoenix = 11:00 AM in New York |
Conversion Table
| Arizona (MST) | Eastern, summer (EDT) | Eastern, winter (EST) |
|---|---|---|
| 6:00 AM | 9:00 AM | 8:00 AM |
| 7:00 AM | 10:00 AM | 9:00 AM |
| 8:00 AM | 11:00 AM | 10:00 AM |
| 9:00 AM | Noon | 11:00 AM |
| 10:00 AM | 1:00 PM | Noon |
| Noon | 3:00 PM | 2:00 PM |
| 2:00 PM | 5:00 PM | 4:00 PM |
| 3:00 PM | 6:00 PM | 5:00 PM |
| 5:00 PM | 8:00 PM | 7:00 PM |
| 6:00 PM | 9:00 PM | 8:00 PM |
Business-Hours Overlap
For a 9-to-5 schedule on both ends, the working overlap is generous but shifted:
- Summer (3-hour gap): overlap runs 9:00 AM – 2:00 PM Arizona time (Noon – 5:00 PM Eastern). An East Coast colleague's end-of-day request lands in an Arizonan's early afternoon.
- Winter (2-hour gap): overlap runs 9:00 AM – 3:00 PM Arizona time (11:00 AM – 5:00 PM Eastern).
- Calling Arizona from the East Coast: avoid calling before 10:00 AM Eastern in summer — it's still before 7:00 AM in Phoenix.
- Calling the East Coast from Arizona: after 6:00 PM Arizona time in summer, it's past 9:00 PM in New York — probably too late.
Why the Gap Changes
Arizona stays on Mountain Standard Time (UTC−7) all year, while the Eastern zone swings between EST (UTC−5) and EDT (UTC−4). The gap is whatever those offsets say it is: three hours while daylight saving time is in effect, two hours otherwise. The full history of Arizona's opt-out is in our daylight saving time guide.
For an exact answer at any moment, the home page converter auto-detects your time zone and converts any time to Arizona time in one click.