Codes go stale, and a stale code is worse than no code. PFTrace re-checks every firm's offer on a daily schedule, and each firm page shows the date of the most recent check so you can see how current the listing is before you rely on it.
A recent date means the offer was still live at that point — it is not a promise that it is live right now. As a rule of thumb, treat codes checked within the last 7 days as current, and treat the firm's own checkout page as the final word.
If a firm has no date shown, we have no recent check to report for it. In that case the page carries no code, because we would rather show nothing than show an offer we cannot stand behind.
If you find a code that does not work, that is useful to us — it usually means the campaign ended between checks. Let us know the firm and the code and we will re-check it. See also How We Verify.