Often, a contract is entered into and dated on the day of the last signing (as explained above), but contains a different and defined ”effective date” indicating 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 related to past events is a matter of interpretation. Under contract law, the effective date is the date on which an agreement or transaction between or between signatories becomes mandatory. In the event of an IPO, this is the time when the shares can be traded for the first time on a stock exchange. Most agreements contain a date on which the revised terms come into force or are concluded. Often referred to as the effective date, this is traditionally the date on which contractual terms become applicable. The execution date is the date on which both parties sign the contract. It is when both parties agree on conditions and conditions, as the treaty describes. However, this is not necessarily the day the treaty enters into force. So what is the effective date of a treaty? If your app handles a lot of private information, you`ll probably want to make the validity date as striking as possible.