According to community.callofduty.com: UPDATE: The Montreal, Canada Clan War is being delayed by one week due to account issues on some game platforms where players are unable to connect to their Call of Duty accounts. These players’ wins would not correctly count towards Clan Wars. A fix for this issue will be in place on Thursday, February 26th.
As such, Bronze through Platinum Division Clans will compete from Friday, February 27th through Monday, March 2nd. Diamond Division will also now be a 2-day war on that same weekend. We are determining whether the Diamond war will be held on Friday and Saturday, or Saturday and Sunday.
Just an FYI.