@TinoPup I cannot say definitively, but I visited last year on October 10th and the hours I had listed on my itinerary were 9-5, I checked my zoo map from that day and it also says 9-5.
As for what is open/closed, animal wise I don't know if there's a firm schedule or if it's day by day according to temperature. When I was there last year, it was already getting cold (below 10 degrees Celsius, with a notable amount of snowfall the next day) and as such the lemurs and gorillas were indoors, as were the hippos while the giraffes mostly remained inside. The lemurs were particularly disappointing as their new outdoor habitat looks excellent. Overall I still really enjoyed my visit that day, but think Calgary is a zoo probably best seen in warmer months.