Amsterdam is 8 hours ahead of Phoenix during standard time. Phoenix uses Mountain Standard Time (MST, UTC-7) while Amsterdam uses Central European Time (CET, UTC+1). When it's 12:00 PM in Phoenix, it's 8:00 PM in Amsterdam.
Importantly, Arizona (except Navajo Nation) does not observe daylight saving time. During Amsterdam's summer time (CEST), the difference increases to 9 hours.
Best calling time: 7:00 AM - 9:00 AM Phoenix time. This corresponds to 3:00 PM - 5:00 PM in Amsterdam (or 4:00 PM - 6:00 PM during CEST).
Phoenix is one of the few major US cities that doesn't observe daylight saving time. This makes scheduling with European cities like Amsterdam more complex during part of the year.