Often, a contract (as explained above) is entered into and dated to the date of the last signature, but contains another defined „effective date“ that indicates when some or all of the parties` obligations must begin. This date may be in the future or in the past – whether a treaty can create or confirm rights in respect of past events is a matter of interpretation. 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? date of entry into force or signature. The first line often contains a date (on best practices when writing a date in contracts – see section 6.3 d). This would be the date on which the contract was concluded or the date on which the contract enters into force economically, unless otherwise specified in the contract. . .