Add 'apps/mobile/' from commit '5fa30f365f21531094cd4d2045042bb4f1370ac3'

git-subtree-dir: apps/mobile
git-subtree-mainline: 86f8987dff
git-subtree-split: 5fa30f365f

apps/mobile/lib/live-clock.ts

@@ -0,0 +1,21 @@
+import { useEffect, useState } from "react";
+
+function formatClockTime(date: Date) {
+  return date.toLocaleTimeString(undefined, {
+    hour: "numeric",
+    minute: "2-digit",
+  });
+}
+
+export function useLiveClock() {
+  const [time, setTime] = useState(() => formatClockTime(new Date()));
+
+  useEffect(() => {
+    const tick = () => setTime(formatClockTime(new Date()));
+    tick();
+    const id = setInterval(tick, 15_000);
+    return () => clearInterval(id);
+  }, []);
+
+  return time;
+}