system clock
nounUK /ˈsɪstəm klɒk/
US /ˈsɪstəm klɑːk/
A system clock is the clock inside a computer that keeps track of the time.
The system clock tells the computer what time and date it is.
OTHER MEANINGS
2. A clock signal that synchronizes the parts of a computer so they work together.
The processor uses the system clock to time each step it takes.
3. The main time source a program uses to measure how long things take.
The app reads the system clock to record when each event happens.
4. The clock that keeps running even when the computer is turned off, powered by a small battery.
When the system clock battery died, the computer forgot the date.