Which of these can only measure time interval and not the time of day?

Can you identify the timekeeping device that can only measure time interval and not the time of day?

Pendulum Clock

A pendulum clock is a type of clock that uses a swinging pendulum as its timekeeping element. It was invented by Dutch scientist Christiaan Huygens in the 17th century. Pendulum clocks are known for their accuracy in measuring time intervals, as the period of swing of a pendulum is constant and can be used to regulate the movement of the clock hands.

Unlike other timekeeping devices such as sundials, sand clocks, and quartz clocks, a pendulum clock cannot directly indicate the time of day. Instead, it can accurately measure time intervals by counting the number of swings of the pendulum.

Therefore, if you are looking for a clock that can measure time intervals with high precision but not the time of day, a pendulum clock would be the ideal choice.