Does the company need to dismiss employees one month in advance?

According to the law, the calculation method of the employer dismissing employees for one month is natural month.

If the employing unit proposes to terminate the labor contract with the employee, it shall notify the employee in writing 30 days in advance or pay the employee one month's salary in addition to the forehead of the termination of the labor contract.

Legal basis: Article 40 of the Labor Contract Law is under any of the following circumstances, the employer may terminate the labor contract after notifying the employee in writing 30 days in advance or paying the employee an extra month's salary:

(1) The employee is sick or injured non-work-related, and cannot engage in the original job or other jobs arranged by the employer after the prescribed medical treatment period expires;

(two) the laborer is not competent for the job, and he is still not competent for the job after training or adjusting his post;

(3) The objective conditions on which the labor contract was concluded have changed greatly, which makes it impossible to perform the labor contract, and the employer and the employee cannot reach an agreement on changing the contents of the labor contract through consultation.