Passport validity question !

Since France is a Schengen country, the rule is that passports must be valid for at least three months beyond your planned date of departure from the Schengen area. So if you leave France on September 15, your passport must be valid until at least December 15th. https://fr.usembassy.gov/traveling-to-france-know-before-you-go/

The other issue is when do you leave for France?

If you encounter an airline gate agent that thinks you have insufficient time left on your passport you may have an issue departing for France.

Canada works on the 3 month principal. If you aren't flying via the US, what they say doesn't matter. I know this strike is stressful, but I can't imagine it lasting long....though the backlog may stretch exponentially. If you live somewhere you can apply for your renewal in person, they can at least give you a timeline when you see someone face to face. There are also expedited options, and renewals are faster than first passports. But that all will be determined after the strike ends. At least you still have your current passport and it isn't in the mail to the Passport office somewhere.
Here is the website to check timelines, once strike is done. https://www.canada.ca/en/immigration-refugees-citizenship/services/canadian-passports/processing-times.html

These are the guys i would trust. Its who the airlines use: https://www.iatatravelcentre.com/

Thank you all for your supported very good information .
I feel more confident about travelling with my "3 months left on it when I leave Paris" passport! I will shorten my trip a few days, however, to be sure!

Thank you also for clarifying that it is a calendar month, as in September 15 to December 15th. I am not sure where the information source is but thats what makes sense!
This community always comes through.

The bigger concern in these matters is not the published immigration rules, but how the AIRLINE interprets them. Gate agents are a strict first line of enforcement because the company can be on the line for very large fines if a passenger is turned away at immigration.

Thusly, I'd comb your airline's site for their policy, and if you fall within it, print it out in case you're challenged at check-in.

Scudder, I agree and that link i put up is the source the airlines use in their determination. Thats why its the only one I would trust.