On the Page & Survey tab, head to the Survey Questions and Dynamic Content section. Click Edit all:
You'll see the Edit All questions dialog:
From this dialog, you can stop receiving responses by clicking Close all now, or input a future date to stop receiving responses. To do this, click in the date box and select a date and time as you did in Option 2 above, and then click Set Close Date.
You can verify the time has been set by editing one of the questions and verifying the close date. To do this, click on the Gear icon for a question and select Options:
After the closing date, the question will be marked as Closed in red at the bottom right of the question box:
Not what you were looking for? Check out our article on How to set a close date for receiving input.