initial commit

frontend/src/lib/time.ts

@@ -0,0 +1,7 @@
+export function extractDate(dateString: string): string {
+  const date = new Date(dateString);
+  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}`;
+}