Arizona to Taiwan: Always Exactly 15 Hours
Taipei is 15 hours ahead of Arizona — every day of the year. Arizona stays on MST (UTC−7) and Taiwan stays on National Standard Time (UTC+8), and neither observes daylight saving time, so the gap never moves. Unlike an East-Coast partner, whose offset to Taipei shifts twice a year, an Arizona–Taiwan schedule set once is correct forever.
That stability matters for one of Arizona's most important trade relationships — with TSMC's Phoenix fabs and their supplier network, a lot of people now plan calls across exactly this gap.
The Quick Rule
Add 15 hours — or, easier in practice: add 3 hours and flip to the next day's opposite half. 4:00 PM Tuesday in Phoenix is 7:00 AM Wednesday in Taipei.
Conversion Table
| Arizona (MST) | Taipei (same/next day) |
|---|---|
| 6:00 AM | 9:00 PM, same day |
| 7:00 AM | 10:00 PM, same day |
| 8:00 AM | 11:00 PM, same day |
| Noon | 3:00 AM, next day |
| 3:00 PM | 6:00 AM, next day |
| 4:00 PM | 7:00 AM, next day |
| 5:00 PM | 8:00 AM, next day |
| 6:00 PM | 9:00 AM, next day |
| 7:00 PM | 10:00 AM, next day |
Best Meeting Windows
- Arizona late afternoon (4:00–7:00 PM) = Taipei morning (7:00–10:00 AM, next day). The most comfortable regular slot — end of the Arizona workday meets the start of Taipei's.
- Arizona early morning (6:00–8:00 AM) = Taipei evening (9:00–11:00 PM). Workable for occasional calls when Taipei-side flexibility is limited to their evening.
- Midday overlap doesn't exist — noon in Phoenix is 3:00 AM in Taipei. Anything between roughly 9:00 PM and 3:00 PM Arizona time lands outside Taipei's waking business hours.
Remember the date line effect when scheduling: a "Monday call" for Arizona is a Tuesday meeting in Taipei. Calendar invites with time zones set correctly handle this automatically — writing times in an email by hand is where the next-day mistake usually happens.
The home page converter includes Taipei, and the live world table shows Taipei and Arizona side by side with each city's current day of the week.