On the Page & Survey tab, scroll down to the Close at a specific time section. 

Click on the Calendar icon and select a close day.

Click on the Clock icon to specify a close time.

Please note all future close dates are currently stored and implemented in US Eastern time.

To save your changes, click on the green Schedule Close Date button.

After the closing date, all questions will be marked as Closed in red at the bottom right of the question box. 

You can re-open a project at any time.
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Not what you were looking for? Check out our article on How to set a close date for receiving input.
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​Related articles:
​Schedule a close date for all questions
​Schedule a close date for a single question
​How to un-archive a project re-open a survey
​How to delete a project
​Archiving a project
​How to re-open a closed question (when you don't want to re-open all questions)
​How to close a project