When does Mark Carney become prime minister?

It looks like Carney will be made PM on Friday, he'll have a quick diplomatic tour in Europe, and then he'll call an election.

Interesting that he's doing the European tour first. Presumably he's hoping to come back with assurances of trade agreements to talk about during the election.

Original: https://www.theglobeandmail.com/politics/article-mark-carney-liberal-leader-transition-prime-minister-explainer/