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Hi Julien. Got it. The method you're describing sounds contradictory to the designed uses of canonical and as such will be difficult to make work in this approach.  Here's a few reasons... You're relying on the search engines to recognize the changes and apply them in a distinct time frame. While Google tends to be quick there's no guarantee that the changes will be applied in a fashion that lines up with your campaign dates. The thing you want to make canonical (the product) is moving from location to location. Canonical is specifically an attribute for URLs and ones that are supposed to stay static. It seems like it would make more sense to have the product be on a dedicated, canonical URL and just change the promotion around it. A redirect could better serve your purposes. With conditional time frames and offers you're probably best served by using 302 redirects. Cheers!