When Two Accounts Disagree on the Date

Sooner or later in almost every chronology, two sources place the same event on different dates. A witness recalls a meeting happening "around March," while a diary entry suggests April. Neither party is necessarily lying — memory for dates is famously unreliable, and paper records have their own quiet errors. The question is what to do with the disagreement rather than which account to believe outright.

The instinct to pick a winner is understandable but usually premature. A more useful first step is to record both dates, note their source, and mark the entry as contested rather than resolved. A chronology that hides its uncertainty is more dangerous than one that shows it plainly, because a hidden gap tends to resurface at the worst possible moment — during a legal review, or in a reader's inbox after publication.

Anchor to documents where you can

Where a document exists — an invoice, a dated email, a court filing — it should generally take precedence over recollection, simply because documents don't drift the way memory does. That doesn't make the document infallible; dates get mistyped, and paperwork sometimes lags behind the event it describes. But a document gives you something to test the recollection against, rather than two equally unverifiable claims sitting side by side.

• Record every date with its source, not just the date itself.
• Flag approximate dates visibly rather than rounding them silently.
• Treat unresolved conflicts as a gap worth pursuing, not a detail to smooth over.

Letting the gap do some work

A contested date is often more informative than a settled one. It can point toward a second document that would resolve the question, or toward a follow-up conversation you hadn't planned to have. Treated this way, the disagreement becomes part of the investigation rather than an obstacle to it — one more thread that, pulled gently, sometimes leads somewhere useful.

The discipline, in the end, is fairly plain: write down what you actually know, keep the uncertain parts visibly uncertain, and resist the temptation to tidy the record before the record is ready to be tidy.