Admission / Admission Settings / General Admission Settings / Intakes Settings / Notification message for closed Intakes
Here you write a text as information for users who try to create a new application when the intakes date has expired.
Setting -> Admission_Notification_Message_Closed_Intake
The admission user sees the text containing the setting
To set an expiry date for intakes you have to go to Admission / Dropdown lists as shown in the picture below