Hi faraz_fahimi,
I found this in FAQ. I could not find any where that application will be rejected. I think to reject application or not is final decision of officer working on the file not members on this forum.
https://eservices.cic.gc.ca/rescalc/redir.do?redir=faq
Q15: Why is it important that the application date used in the calculation and the date of signature on the application form and the calculation printout be the same?
A15: This is important so that there is no confusion on your application date because your eligibility for citizenship is based on that date. If there is confusion, there could be delays in processing your application while we try to clarify the situation, especially if one of the dates makes you ineligible for citizenship. If the confusion cannot be resolved, the information appearing in your application form will be taken as the correct information and used to determine eligibility.