Kapost has a variety of publishing options, one of them being "Schedule a Post" to go live based off a date and time you set, much like how CMS' do this.
To schedule a post, click the "Publish" button:
Once you've clicked the "Publish" button, a pop-up will appear and you will see an option to edit "Publish On." "Publish On" defaults to immediately, but if you click the "edit" button, you can choose which date and time you prefer to schedule this post to. Once you select and click "OK" the post will go to live, on the desired date and time.