For example, if you move into a new apartment, you can sign the lease in advance. Often, landlords and tenants sign the contract weeks or sometimes months in advance. While you can sign the lease well in advance of the official entry into your new building, you will not be subject to the terms of your lease until after the effective date. For most leases, this is the first day of your fixed-term or auto-renewing lease agreement. This is also often the day when you can get and collect the keys. The date of performance is the date on which both parties sign the contract. It is that both parties accept the general conditions of sale, as described in the contract. However, it is not necessarily on the same day that the treaty will enter into force. So what is the date of entry into force of a treaty? First, the effective date is sometimes used to refer to the date indicated in the introductory clause, as in this example – which I have not corrected, although I have changed the names – of the SEC`s EDGAR database: the date of the contract is normally written on the front page and on the first page of the contract (although there is no legal obligation). Typically, this is the date on which the last party signed the contract. This date is generally what both parties consider to be the date on which the contract was entered into and entered into force, unless there is another defined “effective date” or “initial date”. If, at the beginning of the contract, a date that is not that of the last signature may lead to confusion or be effective in interpreting the actual beginning of the contract.
However, the date in front of the contract cannot necessarily be considered as the date of entry into force of the contract. This depends on the intention of the parties and the date on which the other elements of the conclusion of a contract were fulfilled (these are the offer, acceptance, consideration, intention to create legal relationships and certainty of conditions). The entry into force or validity clause of the Agreement shall fix the date of entry into force of the rights and obligations arising from the Agreement. The date of entry into force shall not be the same as the date of execution. In the absence of a date of entry into force, the terms of the implementing agreement shall take effect. This language makes anyone who reads the written contract understand that they have been demoted. It also explains why the contract is demoted. The agreement will start on [date | Date of this Agreement] and shall apply for a period of  years and shall end thereafter.
When signing your next contract, take the time to read the document in depth. Now that you know the difference between a validity date and a completion date, pay attention to the document to see exactly when it will come into effect….