Shenzhen 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 Shenzhen.
Shoot for 3:00 PM to 6:00 PM in Anchorage; your Shenzhen 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. The date rolls over between them: Shenzhen is on the next day relative to Anchorage during these hours. Daylight saving complicates things slightly: Anchorage observes it, Shenzhen doesn't, so the difference flexes by an hour part of the year.