A wall clock uses a vertical spring-mass system to measure the time. Each time the mass reaches an extreme position, the clock advances by a second. The clock gives correct Lime at the equator. If the clock is taken to the poles it will

in the spring- mass system the time period does not depend on the gravitational field, it simply depends on spring constant and mass.

(It can also be seen in the given formula).

It will give correct time at any place on the earth.