First off, there are a number of saints named Francis. You need to be specific. Secondly, only the pope can canonize a saint. Saint Francis was not a pope.
Francis de Sales was in no position to canonize anyone. Only the pope can canonize.
It means when did the saint get canonize or when did the Church declare that person to be a saint. Canonization/canonize is when the Catholic church declares a dead person to be a saint. It's a long and lengthy process to declare/canonize a person to be a saint.
The Church canonized Saint Francis because of his holiness, exemplary life of poverty and devotion to God, and the miracles attributed to him. Saint Francis is renowned for founding the Franciscan Order and his love for all of God's creation, which inspired many to follow his example.
Father Serra has been beatified but has not yet been canonized. It was recently announced by the Vatican that Pope Francis will canonize Father Serra when he comes to the United States in the fall of 2015.
Which Saint Francis? There are several.
Which Saint Francis? There are several.
Which Saint Francis? There are several.
Which Saint Francis? There are several.
Which Saint Francis? There are several.
Which Saint Francis? There are several saints named Francis.
There is no saint named Francis Johnson.
Which Saint Francis? There are several.