Phoenix is 15 hours behind Singapore year-round. When it's 11:00 PM in Singapore, it's 8:00 AM the same day in Phoenix. Neither Phoenix nor Singapore observes daylight saving time, so this difference is constant.
Arizona (except the Navajo Nation) does not observe daylight saving time, making Phoenix one of the few US cities with a consistent time difference to Asia throughout the year.
Optimal meeting window: 5:00 AM - 7:00 AM Phoenix time (8:00 PM - 10:00 PM Singapore). Early morning Phoenix catches late evening Singapore.
Phoenix's semiconductor industry has ties to Singapore's electronics manufacturing sector, with both cities being major tech hubs in their regions.