The reasons that cause changing of Earth daytime by increasing and decreasing velocity of rotation around its self

Abstract

Earth velocity changes under many reasons. They cause variations in the
length of daytime. These reasons are; interior changes, which usually occur
during events that tend to speed up Earth’s rotation slightly but noticeably,
and Outward changes, where material that was typically at one point at a
higher elevation on Earth surface falls down to be at a lower point. The first
reason may show in several figures like earthquake and condensing core of
earth. On the other hand, tide, melting glacier poles, and changing weather
they cause the other reason. The amount of time that increasing or decreasing
in a day until now do not exceed few seconds, but on the massive scale of
time as the age of earth it becomes important value.