fix: preserve deadline calendar days (Closes #719)

frontend/agenda-replan.js

@@ -9,6 +9,10 @@ function createAgendaReplan({ now = () => new Date(), update }) {
     String(date.getMonth() + 1).padStart(2, '0'),
     String(date.getDate()).padStart(2, '0'),
   ].join('-');
+  const dueDay = value => {
+    const match = String(value || '').match(/^(\d{4}-\d{2}-\d{2})(?:$|T)/);
+    return match ? match[1] : '';
+  };
   const current = () => active ? items[index] || null : null;
   const snapshot = () => ({
     active,
@@ -40,7 +44,7 @@ function createAgendaReplan({ now = () => new Date(), update }) {
   return {
     start(overdue) {
       items = (overdue || []).slice().sort((left, right) =>
-        new Date(left.due_date).getTime() - new Date(right.due_date).getTime() ||
+        dueDay(left.due_date).localeCompare(dueDay(right.due_date)) ||
         String(left.repository || '').localeCompare(String(right.repository || '')) ||
         Number(left.number || 0) - Number(right.number || 0)
       );

frontend/dashboard.js

@@ -1524,6 +1524,14 @@
     qs('[data-find-work-estimate]')?.focus();
   }
 
+  function formatCalendarDueDate(value) {
+    const match = String(value || '').match(/^(\d{4})-(\d{2})-(\d{2})(?:$|T)/);
+    if (!match) return '';
+    return new Intl.DateTimeFormat(undefined).format(
+      new Date(Number(match[1]), Number(match[2]) - 1, Number(match[3]))
+    );
+  }
+
   let planTodayTrigger = null;
   function formatPlanMinutes(minutes) {
     if (!Number.isInteger(minutes)) return 'Not set';
@@ -3008,7 +3016,7 @@
       qs('#save-issue-due-date').disabled = false;
       qs('#clear-issue-due-date').disabled = !detail.due_date;
       qs('#issue-due-status').textContent = detail.due_date ?
-        'Due ' + new Date(detail.due_date).toLocaleDateString() : 'No due date set.';
+        'Due ' + formatCalendarDueDate(detail.due_date) : 'No due date set.';
       if (qs('#issue-planning').open && !offlineDetail) loadIssuePlanning();
       if (offlineDetail) {
         setOfflineDetailControls('issue');

frontend/my-work.js

@@ -1,15 +1,26 @@
-function issueDueState(dueDate, now) {
-  if (!dueDate) return null;
-  const due = new Date(dueDate);
-  if (Number.isNaN(due.getTime())) return null;
-  const day = value => value.getFullYear() + '-' + String(value.getMonth() + 1).padStart(2, '0') + '-' +
+function calendarDay(value) {
+  const match = String(value || '').match(/^(\d{4})-(\d{2})-(\d{2})(?:$|T)/);
+  if (!match) return '';
+  const date = new Date(Number(match[1]), Number(match[2]) - 1, Number(match[3]));
+  return date.getFullYear() === Number(match[1]) && date.getMonth() === Number(match[2]) - 1 &&
+    date.getDate() === Number(match[3]) ? match.slice(1, 4).join('-') : '';
+}
+
+function localDay(value) {
+  return value.getFullYear() + '-' + String(value.getMonth() + 1).padStart(2, '0') + '-' +
     String(value.getDate()).padStart(2, '0');
-  const dueDay = day(due);
-  const today = day(now);
+}
+
+function issueDueState(dueDate, now) {
+  const dueDay = calendarDay(dueDate);
+  if (!dueDay) return null;
+  const today = localDay(now);
   if (dueDay < today) return { label: 'Overdue', priority: 2 };
   if (dueDay === today) return { label: 'Due today', priority: 2.5 };
   return {
-    label: 'Due ' + due.toLocaleDateString(undefined, { month: 'short', day: 'numeric' }),
+    label: 'Due ' + new Date(
+      Number(dueDay.slice(0, 4)), Number(dueDay.slice(5, 7)) - 1, Number(dueDay.slice(8, 10))
+    ).toLocaleDateString(undefined, { month: 'short', day: 'numeric' }),
     priority: 4,
   };
 }
@@ -569,18 +580,22 @@ function filterMyWork(items, selectedFilter, selectedMilestone = 'all') {
 
 function agendaMyWork(items, now = new Date()) {
   const start = new Date(now.getFullYear(), now.getMonth(), now.getDate());
-  const tomorrow = new Date(start); tomorrow.setDate(tomorrow.getDate() + 1);
-  const afterTomorrow = new Date(start); afterTomorrow.setDate(afterTomorrow.getDate() + 2);
-  const horizon = new Date(start); horizon.setDate(horizon.getDate() + 7);
+  const today = localDay(start);
+  const tomorrowDate = new Date(start); tomorrowDate.setDate(tomorrowDate.getDate() + 1);
+  const tomorrow = localDay(tomorrowDate);
+  const afterTomorrowDate = new Date(start); afterTomorrowDate.setDate(afterTomorrowDate.getDate() + 2);
+  const afterTomorrow = localDay(afterTomorrowDate);
+  const horizonDate = new Date(start); horizonDate.setDate(horizonDate.getDate() + 7);
+  const horizon = localDay(horizonDate);
   return (items || []).flatMap(item => {
     if (item?.kind !== 'issue' || !item.is_assigned || !item.due_date) return [];
-    const due = new Date(item.due_date);
-    if (Number.isNaN(due.getTime()) || due >= horizon) return [];
-    const group = due < start ? 'Overdue' : due < tomorrow ? 'Today' :
+    const due = calendarDay(item.due_date);
+    if (!due || due >= horizon) return [];
+    const group = due < today ? 'Overdue' : due < tomorrow ? 'Today' :
       due < afterTomorrow ? 'Tomorrow' : 'Next 7 days';
-    return [{ ...item, agenda_group: group, _agenda_due: due.getTime() }];
+    return [{ ...item, agenda_group: group, _agenda_due: due }];
   }).sort((left, right) =>
-    left._agenda_due - right._agenda_due ||
+    left._agenda_due.localeCompare(right._agenda_due) ||
     String(left.repository || '').localeCompare(String(right.repository || '')) ||
     Number(left.number || 0) - Number(right.number || 0)
   ).map(({ _agenda_due, ...item }) => item);