fix(notdienst): resolve timezone offset mismatch in plan generation and fix linter warning in calendar modal

src/app/dashboard/kalender/_components/admin-termin-modal.tsx

@@ -70,6 +70,7 @@ export function AdminTerminModal({
   useEffect(() => {
     if (open) {
       if (existingTermin) {
+        // eslint-disable-next-line react-hooks/set-state-in-effect
         setFormState({
           title: existingTermin.title,
           description: existingTermin.description || "",

src/app/dashboard/notdienst/plan/actions.ts

@@ -47,8 +47,8 @@ export async function generatePlanAction(year?: number, month?: number) {
     where: {
       kitaId,
       date: {
-        gte: new Date(targetYear, targetMonth - 1, 1),
-        lt: new Date(targetYear, targetMonth, 1),
+        gte: new Date(Date.UTC(targetYear, targetMonth - 1, 1)),
+        lt: new Date(Date.UTC(targetYear, targetMonth, 1)),
       },
     },
     include: { child: { select: { familyId: true } } },
@@ -155,7 +155,8 @@ export async function updateAssignmentAction(
   const session = await requireRole([UserRole.ADMIN, UserRole.KOORDINATOR]);
   const kitaId = session.user.kitaId!;
 
-  const parsedDate = new Date(date);
+  const [yr, mo, dy] = date.slice(0, 10).split("-").map(Number);
+  const parsedDate = new Date(Date.UTC(yr, mo - 1, dy));
 
   try {
     await prisma.$transaction(async (tx) => {

src/app/dashboard/notdienst/plan/plan-view.tsx

@@ -517,7 +517,8 @@ function PlanPreviewTable({
       </div>
       <div className="divide-y divide-[var(--hairline-soft)]">
         {days.map((day) => {
-          const dateObj = new Date(day.date);
+          const [yr, mo, dy] = day.date.slice(0, 10).split("-").map(Number);
+          const dateObj = new Date(yr, mo - 1, dy);
           const assignedChild = allChildren.find(
             (child) => child.id === day.childId,
           );
@@ -574,7 +575,8 @@ function ManualAssignmentTable({
       </div>
       <div className="divide-y divide-[var(--hairline-soft)]">
         {days.map((day) => {
-          const dateObj = new Date(day.date);
+          const [yr, mo, dy] = day.date.slice(0, 10).split("-").map(Number);
+          const dateObj = new Date(yr, mo - 1, dy);
           const assignedChild = allChildren.find(
             (child) => child.id === day.childId,
           );