When editing a Content Page's settings, you'll find a checkbox for "Show Date on ISEBOX". Enabling this will show a date stamp on the ISEBOX page, as well as control the publish date of the ISEBOX and its content.
This can be any date you choose, and will appear just above the Main Text Area on your ISEBOX page.
To show the date:
1.) Click on Projects in the Navigation Menu.
2.) Open the Project where the Content Page, which you'd like to edit is in.
3.) Hover with you mouse over the desired Content Page, and click edit.
You are now at your Content Page's settings.
4.) Go to the Main Details section
5.) Just click on the box that says Show Date on Content Page to set the display date.
6.) After finishing the desired changes, click Save & Exit.
Hint: You will see a green message popping up on top if everything has been done properly.