fix: refactor process content

app/lib/date.ts

@@ -73,3 +73,16 @@ export function formatDateYyyyMmDd(isoDateString: string): string {
 	const day = String(date.getDate()).padStart(2, '0');
 	return `${year}-${month}-${day}`;
 }
+
+// Function to check if date is invalid (like "0001-01-01T00:00:00Z")
+export function isValidDate(dateString: string | null | undefined): boolean {
+  if (!dateString) return false
+  // Check for invalid date patterns
+  if (dateString.startsWith('0001-01-01')) return false
+  try {
+    const date = new Date(dateString)
+    return !isNaN(date.getTime())
+  } catch {
+    return false
+  }
+}