When can I pay the social security fee at the latest?

The labor law stipulates that employees should pay social security when establishing labor relations with the unit, that is, the first month when employees start working, or pay social security when signing labor contracts. It is in line with the requirements to pay employees after signing a formal contract. Is there a law that specifies the time? 1, the labor law stipulates that both parties shall establish a labor relationship from the date of employment, and the unit shall sign a labor contract with the employee within one month from the date of actual employment (pay double wages for more than one month), and the term of the labor contract includes a probation period. 2. After the contract is signed, the unit shall declare for employees to participate in social insurance and pay social insurance premiums according to law, and the part that employees should pay shall be withheld and remitted by the unit from employees' wages. 3, the payer must declare the amount of social insurance premiums payable to the social insurance agency on a monthly basis. 4. The unit shall sign a written labor contract with the employee within one month from the date of employment, and pay the social security fee for the employee in the second month from the date of employment. 5. The time to pay social security is a national policy. The Interim Regulations on the Collection and Payment of Social Insurance Fees was promulgated on 1999, and the payment time of different provinces, cities and industries is inconsistent. The earliest time was 1992, and state-owned enterprises basically started to pay 1994. Article 72 of the Labor Law