A date on an observation card helps keep a small collection of sample notes in sequence. The card can capture when the view was recorded without implying that one result applies to every material or future project.
Preserve the question with the date
Write the one thing you were checking alongside the date and keep it with the sample image. When comparing notes later, review each sample in its own context instead of treating it as a general performance promise.
Browse /updates/ for practical sample-review habits.