"12 hours two shifts" means twelve hours of work, belonging to the day shift night shift work.

"Eight o'clock in the morning and eight o'clock at night" means eight o'clock post: no matter day or night shift is eight o'clock work.

So two shifts of 12 hours, 8 a.m. and 8 p.m. The shifts are the morning shift: 8 a.m. to work at 8 p.m. and the evening shift: 8 p.m. to work at 8 a.m. the next day.

The labor time system is the system of work shifts set by the enterprise during the working day. It can be categorized into single-shift system and multi-shift system.

Single shift system. Only one shift of production is organized every day. It is conducive to the health of the workers and facilitates the management of personnel and production. But it will cause equipment and plant idle, can not be fully utilized.

Multi-shift system. Organize two or more work shifts per day. It can be divided into two-shift system and three-shift system.

Two-shift system, the machine runs 24 hours a day.

Three shifts and two runs, divided into three shifts of 24 hours, rotating rest, work.

Expanded:

This is a type of labor time system, which is a system of work shifts set by a company during the workday. It can be divided into single-shift system and multi-shift system; single-shift system, only one shift of production is organized every day. It is conducive to the health of the workers and facilitates personnel and production management. But it will cause equipment and plant idle, can not be fully utilized.

Multi-shift system, the daily organization of two or more than two shifts of production; can be divided into two-shift system and three-shift system.

Usually, the 16-hour working time is divided into two shifts of eight hours each (8-hour working system).

For example, xx restaurant is open from 8 am to 12 pm, divided into two shifts. One from 8am to 4pm and the other from 4pm to 12pm.

According to the country's current labor law, a work system is in place under which workers are required to work no more than eight hours a day and no more than 40 hours a week on average. Workers who provide labor in accordance with the time agreed upon in the labor contract are entitled to the corresponding wages and benefits. If they work overtime, they are entitled to overtime pay.

Article 41 An employer may, for reasons of production and operation, extend the working hours after consultation with the labor union and the workers, and generally the working hours shall not exceed one hour per day; if the working hours need to be extended for special reasons, the extension of the working hours shall not exceed three hours per day under the condition of protecting the health of the workers, but the working hours shall not exceed thirty-six hours per month.

Reference: