Vancouver is 15 hours behind Shenzhen
Best overlap: 8:00 AM to 9:00 AM in Shenzhen is 5:00 PM to 6:00 PM in Vancouver.
The hours that work for both Shenzhen and Vancouver are 8:00 AM to 9:00 AM (Shenzhen) and 5:00 PM to 6:00 PM (Vancouver). The shared window is only 1 hour — treat 8:00 AM in Shenzhen (5:00 PM in Vancouver) as the one fixed point and plan everything else around it. Worth a glance at the calendar — Vancouver is on the previous day, so align on the date as well as the time. One seasonal catch: Vancouver springs forward and falls back, but Shenzhen doesn't, so the gap changes by an hour for several months of the year.