lovezebs, and
Jayden--canaries need to see light that changes in day length, just like outside. The day length should range from about 10 hours (at the winter solstice) to about 14.5 hours (at the summer solstice).
Without that change in day length, they get messed up hormonally. The result can be a short life (2 or 3 years), constant molt, lack of pep, lack of good singing.
In a bird room, you can just change the light timer about 15 minutes per week. In a house near a window, you can just cover the cage whenever it is dark enough that you need to turn on room lights. Uncover the cage when you go to bed and they'll see sun on the mornings you sleep late!
With this light change, canaries start to molt just after the summer solstice. Males don't usually sing when they're molting. Males will start to sing when the day length works it way to about 12 hours and the molt is finished. They'll continue to sing all the way through the fall and winter and into late spring. Females will start to make a nest at about 13 hours, and be ready to breed at bout 13.5 hours, depending on your variety or strain of canary.