The date on the resignation certificate cannot be changed at will. It should be truthful and issued by the unit at the time of resignation. The resignation certificate is a written proof of the termination of the labor relationship between the employer and the employee. It is a written material that must be issued after the employer and the employee terminate the labor relationship. There is no problem for leaders to modify the resignation date, as long as the resignation date is after the resignation letter is submitted and within one month from the date of submission of the resignation letter.