Upvote:1
Canada temporary resident visas work similarly to the US visitor visas, in that the visa expiration date is the last date you may enter Canada using the visa.
Because your visa (and presumably work permit) will be valid when you re-enter Canada, you will have no problems entering.
Note that Canada now also requires that passports be valid; Canada no longer issues visas with expiration dates later than the passport expiration date. If your passport is near to expiration, you may wish to renew the passport before obtaining a new visa.