Why does Han's laser get paid on the 30th?

Financially, it is stipulated that the salary of Hanzu Laser will be paid on the 30th. According to the laser recruitment information of Han nationality, salary will be paid on the 30th of each month. Shenzhen Dazu Laser is a high-tech enterprise in Shenzhen, a key software enterprise in Shenzhen, a key equipment manufacturing enterprise in Guangdong Province, a national innovative pilot enterprise, a key promotion and demonstration enterprise in the national scientific and technological achievements promotion and demonstration base, and a key software enterprise in the national planning and layout. Its main scientific research projects have been recognized as national torch plan projects.