I have a Canadian Student Visa valid from March, 2016 to March, 2018. The letter that I received along with the visa mentions nothing about the date within which I must enter Canada before it expires. In the letter the "Must enter Canada by" section is kept blank and in the another part of the letter and in another part of the letter "You must seek entry to Canada to obtain study permit (yyyy/mm/dd/)" is also left blank. My question is if that is a typographical error or they generally leave it blank in the letter. I am planning to enter Canada in the May, 2017. I have attached segments of the letter with this question. Thanks.