addDays(now(),-8) results in 2022-12-27
Ignition 7.9.18
Java 8 311
Can you show how you are getting that result? In a specific component, script, etc.?
Thx. You are right that addDays(now(),-8)) returns the correct date. I thought that was the problem.
But no, dateFormat(addDays(now(),-8),‘YYYY-MM-dd’) returns 2022-12-27. Am I using dateFormat correctly?
No, you’re not 
YYYY is week year, not calendar year (yyyy):
https://docs.inductiveautomation.com/display/DOC81/Data+Type+Formatting+Reference
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