License Start Date
When issuing a license, you can set a start date for it. Adding a start date to a license will not allow license activations for until that date. This can be useful to fine-tune usage of a rented or time-limited license, or to make a software available only for an academic term, for example.
Navigate to the product selection screen during the process of issuing licenses. Toggle the "Use custom license values". Under license usage, there is a field called "License Start Date" where you can specify the start date.
If you set a start date on an existing license that had already been activated, it will not affect the license that has already activated it. Instead, it will simply prevent additional license activations until the start date.
Navigate to the license detail screen and press "Edit License". From there you can set or delete the "License Start Date".