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fix(ui): bucket calendar issues by their real day in non-UTC timezones #262

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Merged
martian56 merged 1 commit into from
Jul 5, 2026
+11 −5
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fix(ui): bucket calendar issues by their real day in non-UTC timezones #262

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16 changes: 11 additions & 5 deletions apps/web/src/components/work-item/layouts/IssueLayoutCalendar.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -96,7 +96,7 @@ export function IssueLayoutCalendar({

{/* Day cells */}
{cells.map(({ date, inMonth }) => {
const key = isoDate(date.toISOString().slice(0, 10))!;
const key = localKey(date);
const dayIssues = issuesByDate.map.get(key) ?? [];
const isToday = sameDay(date, new Date(now));
const visible = dayIssues.slice(0, MAX_PER_CELL);
Expand Down Expand Up @@ -203,12 +203,18 @@ function addMonths(d: Date, n: number): Date {
return new Date(d.getFullYear(), d.getMonth() + n, 1);
}

// target_date/start_date arrive as a UTC-midnight ISO timestamp (or a bare
// "YYYY-MM-DD"). The calendar day is the date portion itself; routing it through
// a Date reads local components and shifts the day for non-UTC clients, so take
// the leading date directly. Keys line up with the cell keys built by localKey.
function isoDate(input: string | null | undefined): string | null {
if (!input) return null;
// Accept "YYYY-MM-DD" or full ISO. Truncate to date only.
const t = Date.parse(input);
if (Number.isNaN(t)) return null;
const d = new Date(t);
const match = /^(\d{4})-(\d{2})-(\d{2})/.exec(input);
return match ? `${match[1]}-${match[2]}-${match[3]}` : null;
}

// Local calendar day (Y-M-D) of a Date built from local components.
function localKey(d: Date): string {
return `${d.getFullYear()}-${pad2(d.getMonth() + 1)}-${pad2(d.getDate())}`;
}

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