Syntax to change date format and expiry date

Hi GeraldT330 ,

The formula is checking if the value of the column is smaller than 15778800000 ms in the future and then paints it orange. 

15778800000 ms seconds are

15778800000 ms = 1000 (ms) * 60 (seconds) * 60 (minutes) * 24 (hours) * 182.625 (days)

So if you want just 90 days use

1000 * 60 * 60 * 24 * 90 = 7776000000

That means you just have to exchange 15778800000 with 7776000000 in your formula:

{
	"$schema": "https://developer.microsoft.com/json-schemas/sp/column-formatting.schema.json",
	"elmType": "div",
	"txtContent": "@currentField",
	"style": {
		"color": "=if(@currentField <= @now, 'crimson',if(@currentField <= @now + 7776000000 && @currentField > @now,'orange','black'))",
		"font-weight": "=if(@currentField <= @now, 'bold',if(@currentField <= @now + 7776000000 && @currentField > @now,'bold','normal'))",
		"font-size": "=if(@currentField <= @now, '14px',if(@currentField <= @now + 7776000000 && @currentField > @now,'14px','normal'))"
	}
}

Best Regards,
Sven