Hi @Ben,
You can use below JSON code to format your due date column.
{
"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
"elmType": "div",
"txtContent": "@currentField",
"style": {
"background-color": "=if(@currentField < @now, 'red', 'white')"
}
}
Or apply conditional formatting rule like below.
Make sure the "duedate" column is a date and time column type.
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