Pub. L. 84-68, tit. VI, sec. 604
night work
night work Sec. 604, Employees who perform work between the hours of 6 o’clock post meridian and 6 o’clock ante meridian standard or daylight saving time, depending upon which time is observed where such work is performed, shall be paid extra compensation for each hour of such work at the rate of 10 per centum of their hourly basic compensation. The differential for night duty shall not be included in computing any overtime compensation to which such employees may be entitled.