Calgary is 9 hours behind Moscow
Best overlap: 5:00 PM to 6:00 PM in Moscow is 8:00 AM to 9:00 AM in Calgary.
If you set up a recurring sync, 5:00 PM to 6:00 PM in Moscow (8:00 AM to 9:00 AM in Calgary) is the natural home for it. Calgary is 9 hours behind Moscow, so you only get about 1 hour of overlap a day — worth locking in a standing time like 5:00 PM in Moscow (8:00 AM in Calgary) before it slips. Remember that Calgary shifts for daylight saving and Moscow doesn't, so recalculate the overlap after each clock change.