[3] These rules hold in all canonical matters: universal ordinances, precepts, rescripts, privileges, judicial sentences; but they have nothing to do with problems of chronology or such questions as the determination of the date for the celebration of Easter.
[3] They are not absolute rules, but should be followed when no others have been expressly laid down; liturgical laws regarding, for example, the beginning of the ecclesiastical year, of the solemnity of a feast, remain unchanged.
921, 922, 923, 931), and it is stated that in what pertains to the fulfilment or enforcement of contracts, the prescriptions of the civil law should be complied with, unless there has been some other agreement to the contrary.
Nothing prevents inferior legislators from adopting different rules for the application of their own laws, and it is clearly implied that private persons themselves have the same right in matters which depend on their will, like determining when an article sold should be delivered, paid for, etc.
From 1918[8] to 1983,[9] Book I, Title III of the 1917 Code of Canon Law[1] regulated the computation of time in the Latin Church.