This is custom functionality - I'm really not sure I can help unless you have at least a basic knowledge of PHP. You can use the cron-example plugin as a base or adapt another similar plugin, or you can add a check at the start of the page where you're listing these records to add the New tag, for example, but this all requires some familiarity with PHP to implement properly.
The best thing I can do is refer you to consulting@interactivetools.com for a quote to get it done. It's a quick job for an experienced programmer at least.
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Claire Ryan
interactivetools.com
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