Shenzhen is 15 hours ahead of Calgary
Best overlap: 5:00 PM to 6:00 PM in Calgary is 8:00 AM to 9:00 AM in Shenzhen.
Your shared working hours run 5:00 PM to 6:00 PM in Calgary (8:00 AM to 9:00 AM in Shenzhen). Just 1 hour of shared hours means there's little margin — set 5:00 PM in Calgary (8:00 AM in Shenzhen) and start promptly. Watch the date, too: while it's still the workday in Calgary, Shenzhen is already on the next day. Watch the DST gap — when Calgary changes its clocks and Shenzhen stays the same, this window slides by an hour.