P.R. Laws tit. 31, § 4597
2019-02-20 00:00:00+00
In calculations of interest, a month shall be considered as the twelfth part of a year and as consisting of thirty (30) days, and interest for any number of days less than a month shall be calculated by the proportion which such number of days bears to thirty (30).
History —Civil Code, 1930, § 1655.