The "Expires on" preview under the days-after-event input rendered
nonsense dates (e.g. 25.04.2026 + 120 days → 08.01.2095, ~68 years
out). Cause: handleInputChange stores e.target.value verbatim, which is
a string for <input type="number">, so formData.expires_in_days is "120"
not 120. date-fns addDays does:
_date.setDate(_date.getDate() + amount)
When amount is a string, the + is string concatenation:
25 + "120" = "25120". setDate("25120") then sets day-of-month to 25120,
which carries over by ~68 years.
Fix: cast to Number at the call site. The validation/API-payload
codepaths already work because the comparisons at line 330 and the
JSON payload coerce numerically through different paths — only addDays
was actually broken.
The TypeScript type FormData.expires_in_days: number is a lie because
handleInputChange's [field]: e.target.value sets a string regardless.
Tightening that handler is a separate cleanup; this commit only fixes
the visible date bug.
Paul Nothaft
db29d0e278