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fix: clamp Feb 29 birthdays in non-leap years #163

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Linus Rath
2026-04-08 12:47:24 +02:00
parent 3d76fe6d75
commit a9b9aeb44d
1 changed files with 14 additions and 6 deletions
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lib/birthday-calendar.ts
+14 -6
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@@ -134,14 +134,22 @@ export function generateBirthdayEvents(
for (const yearDate of years) {
const year = yearDate.getFullYear();
const monthStr = String(parsed.month).padStart(2, '0');
const dayStr = String(parsed.day).padStart(2, '0');
const eventStart = `${year}-${monthStr}-${dayStr}T00:00:00`;
// Check if this birthday occurrence falls within the date range
const occurrenceDate = new Date(year, parsed.month - 1, parsed.day);
// Handle Feb 29 in non-leap years: JS silently rolls over to Mar 1,
// but the ISO eventStart string would be invalid. Clamp to Feb 28.
let occMonth = parsed.month;
let occDay = parsed.day;
const occurrenceDate = new Date(year, occMonth - 1, occDay);
if (occurrenceDate.getMonth() !== occMonth - 1) {
occurrenceDate.setDate(0); // last day of previous month
occMonth = occurrenceDate.getMonth() + 1;
occDay = occurrenceDate.getDate();
}
if (occurrenceDate < start || occurrenceDate > end) continue;
const monthStr = String(occMonth).padStart(2, '0');
const dayStr = String(occDay).padStart(2, '0');
const eventStart = `${year}-${monthStr}-${dayStr}T00:00:00`;
const age = parsed.year ? year - parsed.year : undefined;
const ageText = age && age > 0 ? ` (${age})` : '';