I forgot to donate to Knowledge Network by December 31, can you backdate my tax receipt? Knowledge Network Help April 21, 2018 23:29 Updated No, it is a violation of Canada Revenue Agency policy to alter dates on tax receipts. More details on this policy can be found here. Related articles Why do I need a Knowledge Account to watch online? How is Knowledge Network funded? I’ve lost my tax receipt, how can I obtain a new one? Is the Knowledge App free? If I renew early, how is my K: Magazine expiry date adjusted?