Since it's extremely hard to guess future codes, show this webpage or its code in a picture or a video to prove that the scene wasn't shot before today. Good for proving that a dating pic or custom video is recent.
Or put the code on an item to prove that it wasn't dispatched until today.
This is the modern and easier-to-verify version of holding up a newspaper.
Note that the code and its date stamp changes at midnight in the trailing UTC−12:00 time zone, meaning that the code will never be for the following day, no matter where you are on Earth, providing a global "made on or after" guarantee. However this means that the code and its date stamp can be from yesterday in your local zone. A separate code for each time zone may be forthcoming.
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