Night differential is for work performed between the hours of 6 p.m. and 6.a.m. However, if the employee's tour of duty includes 8 or more hours of daylight, the employee is not entitled to night pay even if he or she elects to work during the period when night differential is usually paid.

If core hours are during daylight hours but the tour of duty includes less than 8 daytime hours, the employee is entitled to night pay for the difference between 8 hours and the available number of daytime hours in the tour. If core hours include night work, the employee is entitled to night pay for any non-overtime work performed at night. A part-time employee is entitled to night pay only for night work performed during his or her basic work requirement.

Pay for nightwork equals your rate of basic pay plus a 10 percent differential of your basic rate (including any applicable locality payment or special rate supplement).