What is the difference of the 'Compute' button and the 'Post' button?

Compute button generates all the timekeeping summary (Leaves, Absences, Undertime, Late, ND, Overtime, Regular Holiday, Special Holiday, and Double Holiday) of all the employees in the company.

Once computed, you can cross-check all the data and do necessary updates that you could Overwrite.

While the Post button is to finalize the generated timekeeping summary that you have Computed. Once posted, all the computed data will be used for the Payroll computation.