Conditional formatting SharePoint list based on time elapsed since date

Question

I have a SharePoint list that I'm trying to write some JDSON code for
The field is a date/ time field
I want to highlight to users when >=24 hours has elapsed since the date/time such as by adding a red background to the text
However, every code I write results in a blank field when I view the list
Any suggestions?

Answer 1

@Sam Clark

Based on your description, I understand that there is a date and time column in the list, if the time in the date and time column is less than or equal to current time plus one day, the background shows red colour.

Please try below JSON codes.

 {  
   "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",  
   "elmType": "div",  
   "txtContent": "@currentField",  
   "style": {  
     "color": "black",  
     "background-color": "=if(@currentField <= @now + 86400000,'red',' ')"  
   }  
 }  

Result:

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