Revert to local timezone display for user-facing times

- Changed formatTime back to use toLocaleTimeString (local time)
- Changed formatDateTime back to use toLocaleString (local time)
- App now displays all times in user's local timezone
- Backend still stores times in UTC, frontend converts for display

Makefile

@@ -48,14 +48,20 @@ dev:
 	cd frontend && npm run dev & \
 	wait
 
+# TEST variable can be used to select specific tests:
+# Backend: TEST="-m auth" (marker) or TEST="tests/test_booking.py" (file) or TEST="tests/test_booking.py::TestBooking::test_specific" (specific test)
+# Frontend: TEST="app/login" (file pattern matching app/**/*.test.{ts,tsx})
+# E2E: TEST="auth" (file pattern matching e2e/*.spec.ts)
+TEST ?=
+
 test-backend: db-clean db-ready
-	cd backend && uv run pytest -v
+	cd backend && uv run pytest -v $(TEST)
 
 test-frontend:
-	cd frontend && npm run test
+	cd frontend && npm run test $(if $(TEST),-- $(TEST),)
 
 test-e2e: db-clean db-ready
-	./scripts/e2e.sh
+	./scripts/e2e.sh $(TEST)
 
 test: check-constants check-types-fresh test-backend test-frontend test-e2e
 

frontend/app/utils/date.ts

@@ -13,35 +13,30 @@ export function formatDate(d: Date): string {
 }
 
 /**
- * Format time from ISO string to HH:MM format in UTC.
- * Uses UTC to avoid timezone conversion issues when displaying booking slots.
+ * Format time from ISO string to HH:MM format in local timezone.
  */
 export function formatTime(isoString: string): string {
   const d = new Date(isoString);
-  // Use UTC methods to avoid timezone conversion
-  const hours = String(d.getUTCHours()).padStart(2, "0");
-  const minutes = String(d.getUTCMinutes()).padStart(2, "0");
-  return `${hours}:${minutes}`;
+  return d.toLocaleTimeString("en-US", { 
+    hour: "2-digit", 
+    minute: "2-digit",
+    hour12: false,
+  });
 }
 
 /**
- * Format datetime from ISO string to a readable format in UTC.
- * Uses UTC to avoid timezone conversion issues when displaying appointment times.
+ * Format datetime from ISO string to a readable format in local timezone.
  */
 export function formatDateTime(isoString: string): string {
   const d = new Date(isoString);
-  
-  // Use UTC methods to avoid timezone conversion
-  const weekdays = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
-  const months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
-  
-  const weekday = weekdays[d.getUTCDay()];
-  const month = months[d.getUTCMonth()];
-  const day = d.getUTCDate();
-  const hours = String(d.getUTCHours()).padStart(2, "0");
-  const minutes = String(d.getUTCMinutes()).padStart(2, "0");
-  
-  return `${weekday}, ${month} ${day}, ${hours}:${minutes}`;
+  return d.toLocaleString("en-US", {
+    weekday: "short",
+    month: "short",
+    day: "numeric",
+    hour: "2-digit",
+    minute: "2-digit",
+    hour12: false,
+  });
 }
 
 /**

scripts/e2e.sh

@@ -36,8 +36,13 @@ npm run generate-api-types
 cd ..
 
 # Run tests (suppress Node.js color warnings)
+# If TEST argument is provided, use it as a file pattern
 cd frontend
+if [ -n "$1" ]; then
+	NODE_NO_WARNINGS=1 npx playwright test "$1"
+else
 	NODE_NO_WARNINGS=1 npm run test:e2e
+fi
 EXIT_CODE=$?
 
 # Cleanup