The Canadian Intellectual Property Office (CIPO) hosts patent records from the earlier Canadian Patent Office which granted patents in the early aero period. The Canadian Patent Office Record is digitized and searchable back to 1869.
They used a Canadian Patent Classification (abbreviated CPC but not the same as the CPC used here) until October 1989. It appears to be similar to the USPC system. Since then they use the IPC. They do not seem to use the Cooperative Patent Classification but the IPC is very close.
CIPO patent records online (like this one) show one date, which is the grant date generally. If one looks carefully on the summary (biblio) page, there are buttons on the patent biblio information page to click through to the "Documents' and here one can see handwritten pages which may include at the end a filing date, as perceived by the inventor.