The contract and the 2016 reform

One file, four dates

Facts of the case

date the contract was concluded (Ordinance No. 2016-131, Article 9)
date the legal act was concluded or drawn up (Act No. 2018-287, Article 16, I)
number of the Civil Code article whose applicable version is sought
number of the Civil Code article whose applicable version is sought
intentional concealment of information whose decisive character for the other party the author knows (Article 1137, paragraph 2)
the information concerns the estimate of the value of the performance (Article 1112-1, paragraph 2)
without the defect this party would not have contracted, or would have contracted on substantially different terms; the decisive character is assessed with regard to the persons and circumstances (Article 1130)
obligation arising from this contract
the undertaking was imperfectly performed (Articles 1217 and 1223)
day of the notice to the defaulting debtor to satisfy his undertaking (Articles 1226 and 1231)
agreed price of the performance (Article 1223)
terms of the proportional price-reduction fraction retained for the imperfect performance (Article 1223): the Code gives no proportion, the case supplies it
the creditor accepts an imperfect performance of the contract (Article 1223, 2016 wording)