Make timer that refresh every second in format hh:mm:ss with input to set the start

import * as React from "react";
import { useEffect, useState } from "react";

export const Timer: React.FC<{ startTime: number }> = ({ startTime }) => {
  const [currentTime, setCurrentTime] = useState(new Date());
  useEffect(() => {
    setInterval(() => {
      setCurrentTime(new Date());
    }, 1000);
  }, []);

  const [hour, minute, second] = [
    startTime.getHours(),
    startTime.getMinutes(),
    startTime.getSeconds()
  ];
  const [chour, cminute, csecond] = [
    currentTime.getHours(),
    currentTime.getMinutes(),
    currentTime.getSeconds()
  ];
  return (
    <span>
      {chour - hour >= 10
        ? `${chour - hour}`
        : `0${chour - hour}`}
      :{cminute - minute >= 10 ? `${cminute - minute}` : `0