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 I am Knowledge Partner, do I automatically have an account on knowledge.ca? Can I donate shares to Knowledge Network? How can I donate to Knowledge Network?