pub fn parse_older_than_cutoff(now_rfc3339: &str, spec: &str) -> Result<String>Expand description
Parse an “older than” specification into an RFC3339 cutoff.
Supports:
- Duration expressions: “7d”, “1w” (weeks), “30d” (days)
- Date: “2026-01-01”
- RFC3339: “2026-01-01T00:00:00Z”