There are two ways to determine the length of social service:
1, employees have files to determine the length of service according to the files;
2. If there is no file, employees should keep all the materials that can prove their participation in the work, such as labor contracts and payrolls. As a material approved by the labor department, and can determine the length of service of employees.
Legal basis: Article 10 of People's Republic of China (PRC) Labor Law The state creates employment conditions and expands employment opportunities by promoting economic and social development. The state encourages enterprises, institutions and social organizations to set up industries or expand their operations within the scope prescribed by laws and administrative regulations to increase employment. The state supports laborers to organize themselves voluntarily for employment and engage in self-employment to achieve employment. Article 18 The following labor contracts are invalid: (1) Labor contracts that violate laws and administrative regulations; (2) Labor contracts concluded by fraud or threat. An invalid labor contract is not legally binding from the time it is concluded. If part of the labor contract is confirmed to be invalid, the remaining part is still valid without affecting the validity of the remaining part. The invalidity of a labor contract shall be confirmed by the labor dispute arbitration commission or the people's court. Article 19 A labor contract shall be concluded in written form and contain the following clauses: (1) Term of the labor contract; (2) Work content; (3) Labor protection and working conditions; (4) Labor remuneration; (5) labor discipline; (6) Conditions for the termination of the labor contract; (seven) the responsibility for violating the labor contract. In addition to the necessary provisions stipulated in the preceding paragraph, the parties to a labor contract may agree on other contents through consultation.