marcel/familienarchiv
1
0
Fork 0
Code Issues 114 Pull Requests 3 Actions 2 Packages Projects Releases Wiki Activity

docs(documents): explain monthBoundaryTo day-zero idiom (#385)

Browse Source 
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Marcel
2026-05-08 11:28:58 +02:00
parent 301cfffd1a
commit f68d16ef58
1 changed files with 3 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
frontend/src/lib/document/timeline.ts
View File

@@ -18,6 +18,9 @@ export function monthBoundaryFrom(yearMonth: string): string {
export function monthBoundaryTo(yearMonth: string): string { export function monthBoundaryTo(yearMonth: string): string {
const [year, month] = yearMonth.split('-').map(Number); const [year, month] = yearMonth.split('-').map(Number);
// Day 0 of `month + 1` rolls back to the last day of `month` — so passing
// `month` (1-indexed) into `Date.UTC(year, month, 0)` lands on the last day
// of that month. Handles 28/29/30/31 and leap years without a lookup table.
const lastDay = new Date(Date.UTC(year, month, 0)).getUTCDate(); const lastDay = new Date(Date.UTC(year, month, 0)).getUTCDate();
return `${yearMonth}-${String(lastDay).padStart(2, '0')}`; return `${yearMonth}-${String(lastDay).padStart(2, '0')}`;
} }