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resources/js/components/Tracker.tsx

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+import React, {useEffect, useState} from "react"
+import useTracker from "../hooks/TraskerHook"
+import {Link} from "react-router-dom";
+
+const Tracker = () => {
+
+    const [timer, setTimer] = useState('')
+    const {currentTimeTracker, stopCurrentTimeTrack} = useTracker()
+
+    useEffect(() => {
+        setTimer(formatTimer(currentTimeTracker?.start_at))
+    }, [currentTimeTracker])
+
+    useEffect(() => {
+        setTimeout(() => setTimer(formatTimer(currentTimeTracker?.start_at)), 1000)
+    }, [timer]);
+
+    const formatTimer = (startAt: string|null|undefined) => {
+        if (!startAt) {
+            return '--:--'
+        }
+        let timer = Math.floor(((new Date()).getTime() - (new Date(startAt)).getTime()) / 1000)
+        let hours = Math.floor(timer / 3600)
+        let minutes = Math.floor((timer - hours * 3600) / 60)
+        let secondes = timer - hours * 3600 - minutes * 60
+        return `${hours}:${String(minutes).padStart(2, '0')}:${String(secondes).padStart(2, '0')}`
+    }
+
+    return <div>
+        {currentTimeTracker
+            ? <div className="flex gap-2">
+                <Link to={`/todos/${currentTimeTracker.to_do.id}`}>
+                    {currentTimeTracker.to_do.name}
+                </Link>
+                <span>{timer}</span>
+                <button onClick={stopCurrentTimeTrack}>Stop</button>
+            </div>
+            : <div>--:--</div>
+        }
+    </div>
+}
+
+export default Tracker