In this case, the parties are often tempted to agree to the service contract on March 1 to ensure that the service contract creates and validates rights related to services that have taken place from that date. However, the parties often do not recognize that this effect can be achieved by inserting a “date of effect” or “initial clause” in the service contract, which states that the service contract is dated April 1, but that its provisions apply from March 1. This date, considered to be earlier, should also be recognized in the term clause of the agreement, in order to ensure its coherence and to clearly under-demonstrate the intention of the parties. There are some restrictions on the effect of the backdated clauses, as it is not possible to rewrite history, but in general, if the parties have agreed to an earlier “effective date,” they are entitled to assert all the rights in the agreement against the other party from the date on which they actually sign it, including with respect to the time already elapsed. This article explains when legal documents can be retrodated and, if appropriate, it is legally possible to do so. In case 2, with respect to the lease agreement, the agreement between the parties for the lease to enter into effect from the date of withdrawal of the taker could be acceptable in practice, provided all the following conditions are met. A company (the customer) intends to purchase certain IT services that its IT service provider is scheduled to launch on March 1. Negotiations on the terms of the service contract between the parties take longer than expected, so the claimant begins work in the meantime. The parties agree on April 1 of the terms of the service contract that they intend to sign on that date. Case 2: A tenant used his rented premises a few weeks before the signing of the rental agreement, which must come into effect not from the date of signing, but from the date of withdrawal. CONSIDERING that the parties now wish to conclude this contract, which dates from 15 July 2018, referring to the oral agreement of the parties and taking into account the additional conditions provided by the proposal; A document that has been retrodaes to avoid a legal penalty is probably also illegal.