Merge pull request 'timezone' (#15) from claude/suspicious-wilson into master

Reviewed-on: #15

src/app/api/reports/route.ts

@@ -37,9 +37,12 @@ export async function POST(req: Request) {
   const body = await req.json();
   const { managerName, date } = body;
 
-  // Check if a report already exists for this date and user
-  const reportDate = date ? new Date(date) : new Date();
-  reportDate.setHours(0, 0, 0, 0);
+  // Check if a report already exists for this date and user.
+  // Client always sends a YYYY-MM-DD date string in Central US time;
+  // we store it as UTC midnight so the date string is stable across timezones.
+  const reportDate = date
+    ? new Date(`${date}T00:00:00.000Z`)
+    : new Date(new Date().toLocaleDateString('en-CA', { timeZone: 'America/Chicago' }) + 'T00:00:00.000Z');
 
   let report = await prisma.report.findFirst({
     where: {

src/components/ReportForm.tsx

@@ -23,11 +23,15 @@ export default function ReportForm() {
     }
   }, [status]);
 
+  // Returns today's date as YYYY-MM-DD in Central US time
+  const getCentralToday = () =>
+    new Date().toLocaleDateString('en-CA', { timeZone: 'America/Chicago' });
+
   const fetchReport = async () => {
     try {
       const res = await fetch("/api/reports");
       const data = await res.json();
-      const today = new Date().toISOString().split('T')[0];
+      const today = getCentralToday();
       const todayReport = data.find((r: any) => r.date.split('T')[0] === today);
       
       if (todayReport) {
@@ -49,7 +53,7 @@ export default function ReportForm() {
       const res = await fetch("/api/reports", {
         method: "POST",
         headers: { "Content-Type": "application/json" },
-        body: JSON.stringify({ managerName }),
+        body: JSON.stringify({ managerName, date: getCentralToday() }),
       });
       const data = await res.json();
       setReport(data);