37 U.S.C. § 1004

Computation of pay and allowances for month or part of month

A member of a uniformed service who is entitled to pay and allowances under this title for a continuous period of less than one month is entitled to his pay and allowances for each day of that period at the rate of 1 ⁄ 30 of the monthly amount of his pay and allowances. The thirty-first day of a calendar month may not be excluded from a computation under this section.

( Pub. L. 87–649 , Sept. 7, 1962 , 76 Stat. 490 .)