[IDEM libro secundo definitionum. ] §45.1.124.pr'Insulam intra biennium illo loco aedificari spondes?' ante finem biennii stipulatio non committitur, quamuis reus promittendi non aedificauerit et tantum residui temporis sit, quo aedificium extrui non possit: neque enim stipulationis status, cuius dies certus in exordio fuit, ex post facto mutatur.
[THE SAME, Definitions, book 2.] 'Do you promise that an apartment building shall be built in that place within two years?' Before the end of the two years, the stipulation is not committed, even though the promisor has not built it and so little of the remaining time is left that the building cannot be constructed; for the status of a stipulation, whose day was certain at the start, is not changed by a subsequent fact.
idque et in stipulatione iudicio sistendi causa facta placuit, scilicet ut ante diem stipulatio non committatur, si certum esse coeperit parere stipulationi residuo tempore non posse.
And this has also been accepted in the case of a stipulation made for the purpose of appearing in court, namely, that the stipulation is not committed before the day, even if it has become certain that it is impossible to comply with the stipulation in the remaining time.