Shanghai is 17 hours ahead of Anchorage
Best overlap: 3:00 PM to 6:00 PM in Anchorage is 8:00 AM to 11:00 AM in Shanghai.
Shoot for 3:00 PM to 6:00 PM in Anchorage; your Shanghai colleagues will see that as 8:00 AM to 11:00 AM. A 3-hour overlap gives you a workable daily window; aim for earlier in it to avoid clipping the end of someone's day. Mind the calendar: when you pick a time, Shanghai will be on the next day compared with Anchorage. Note that Anchorage follows daylight saving while Shanghai stays put, so the times above drift by an hour seasonally.