(a) Overtime premiums under section 7(e)(7). Where a collective bargaining agreement or other applicable employment contract in good faith establishes certain hours of the day as the basic, normal, or regular workday (not exceeding 8 hours) or workweek (not exceeding the maximum hours standard applicable under section 7(a)) and provides for the payment of a premium rate for work outside such hours, the extra compensation provided by such premium rate will be treated as an overtime premium if the premium rate is not less than one and one-half times the rate established in good faith by the contract or agreement for like work performed during the basic, normal or regular workday or workweek.

(b) Premiums for hours outside established working hours. To qualify as an overtime premium under section 7(e)(7) the premium must be paid because the work was performed during hours “outside of the hours established * * * as the basic * * * workday or workweek” and not for some other reason. Thus, if the basic workday is established in good faith as the hours from 8 a.m. to 5 p.m. a premium of time and one-half paid for hours between 5 p.m. and 8 a.m. would qualify as an overtime premium. However, where the contract does not provide for the payment of a premium except for work between midnight and 6 a.m. the premium would not qualify under this section since it is not a premium paid for work outside the established workday but only for certain special hours outside the established workday, in most instances because they are undesirable hours. Similarly, where payments of premium rates for work are made after 5 p.m. only if the employee has not had a meal period or rest period, they are not regarded as overtime premiums; they are premiums paid because of undesirable working conditions.

(c) Payment in pursuance of agreement. Premiums of the type which section 7(e)(7) authorizes to be treated as overtime premiums must be paid “in pursuance of an applicable employment contract or collective bargaining agreement,” and the rates of pay and the daily and weekly work periods referred to must be established in good faith by such contract or agreement. Although as a general rule a collective bargaining agreement is a formal agreement which has been reduced to writing, an employment contract for purposes of section 7(e)(7) may be either written or oral. Where there is a written employment contract and the practices of the parties differ from its provisions, it must be determined whether the practices of the parties have modified the contract. If the practices of the parties have modified the written provisions of the contract, the provisions of the contract as modified by the practices of the parties will be controlling in determining whether the requirements of section 7(e)(7) are satisfied. The determination as to the existence of the requisite provisions in an applicable oral employment contract will necessarily be based on all the facts, including those showing the terms of the oral contract and the actual employment and pay practices thereunder.