Come into operation Definition 1 of 1Pro Tip 1/3Legally Binding Used when official rules or laws start to apply and must be followed. The restrictions will come into operation at midnight. Pro Tip 2/3Starting Date Refers to the specific date when something begins to be effective. The policy will come into operation on the first of July. Pro Tip 3/3Initiate Change Indicates the beginning of a change in a system or process. With the upgrade, new features will come into operation.