Feat: Add & integrate add, edit, detail page

app/lib/date.ts

@@ -41,4 +41,12 @@ export function getAge(dateString: string, comparedDate?: string): { idFormat: s
 		idFormat,
 		extFormat
 	};
+}
+
+export function formatDateYyyyMmDd(isoDateString: string): string {
+	const date = new Date(isoDateString);
+	const year = date.getFullYear();
+	const month = String(date.getMonth() + 1).padStart(2, '0');
+	const day = String(date.getDate()).padStart(2, '0');
+	return `${year}-${month}-${day}`;
 }