Barcelona is 6 hours ahead of Ottawa
Best overlap: 8:00 AM to 12:00 PM in Ottawa is 2:00 PM to 6:00 PM in Barcelona.
For a call that suits both sides, look at 8:00 AM to 12:00 PM in Ottawa / 2:00 PM to 6:00 PM in Barcelona. Around 4 hours of overlap is enough to work comfortably, as long as meetings don't drift to the end of one team's day.