SECTION 1. Government employees occupying position items from Division Chief and below, or their equivalent, including those in government-owned or -controlled corporations, whether the nature of their employment is permanent, contractual, temporary, or casual, shall be paid night shift differential at a rate not exceeding twenty percent (20%) of the hourly basic rate of the employee, as determined by the head of the agency, for each hour of work performed between the hours of 6:00 in the evening and 6:00 in the morning of the following day: Provided, That the night shift differential pay provided in this Act shall be in addition to and shall not in any way diminish whatever benefits and allowances are presently enjoyed by government employees.
Hourly basic rate refers to basic salary rate per hour derived by dividing the basic monthly rate by twenty-two (22) working days, and dividing the quotient derived by eight (8) hours.