A practical checklist

  1. Use the date supported by your purchase record.
  2. Put model year or manufacturing context in notes when known.
  3. If the exact purchase date is unknown, preserve the approximate history in notes instead.
Illustrative recordA worked example

Purchased on March 12, 2026; notes say “Used machine, model year listed as 2018 on purchase papers.” Both facts remain clear. A machine acquired “around 2019” keeps that uncertainty in notes.

What to avoid

Do not substitute January 1 for an unknown purchase date without explaining it. An invented exact date can look like documented evidence later.

All equipment guides