Resignation requires a written notice to the unit 30 days in advance, and the probation period is 3 days in advance; Generally speaking, you don't send a notice to terminate the labor contract to the unit, but submit a resignation report to the unit. When the company receives your notice, it should reconfirm with you. If you send it again, you should resign after 30 days, but not now.

Article 37 of the Labor Contract Law of People's Republic of China (PRC) stipulates: "A worker may terminate the labor contract by giving a written notice to the employer 30 days in advance. The employee may terminate the labor contract by notifying the employer three days in advance during the probation period.