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.