Yes, OptiMonk allows creating campaigns which are scheduled for particular date and time.
For this aim create the campaign and within the Campaigns click on the campaign. Then you will see the Schedule button in the top right corner of the screen.
After you can set any data and time you wish.
This option is beneficial to use if you have an incentive valid for a short period of time, so there is no need for you to activate and inactivate the campaign manually.