Legal analysis: the answer to how to calculate the length of service of college graduates is that the length of service of recent graduates is calculated from the starting time of actually taking part in work and paying social security, that is, the accumulated working hours add up to the length of service, excluding the period interval.

Legal basis: Regulations on the Implementation of the Labor Contract Law of the People's Republic of China.

Article 9 The starting time of continuous work 10 year stipulated in the second paragraph of Article 14 of the Labor Contract Law shall be calculated from the date when the employing unit recruits workers, including the working years before the implementation of the Labor Contract Law.

Article 10 If a laborer is assigned to work in a new employer for reasons other than his own, the working years of the laborer in the original employer shall be counted as the working years in the new employer. If the original employer has paid economic compensation to the employee, the new employer will not calculate the employee's working years in the original employer when dissolving or terminating the labor contract according to law.