89641d3c23
The server-side date fallback helpers used local-timezone JS Date methods (setDate/setHours), creating a mismatch when clients send explicit UTC dates (e.g. 2026-02-28T00:00:00Z). Changed to UTC methods (setUTCDate/setUTCHours) to ensure consistent UTC behavior. Also fixed the 90-day churn-risk lookback to use UTC consistently. Co-Authored-By: Paperclip <noreply@paperclip.ing>