js在一个时间范围内产生一个随机时间

	var a = '2020-01-01 08:08:08';
	var b = '2023-02-01 08:08:08';
	var c = new Date(a).getTime();
	var d = new Date(b).getTime();
	var e = d - c;
	var f = Math.random()*e;
	console.log(formatDate(c + f));
	function formatDate(time) {
	      if (time != null) {
	        var datetime = new Date();
	        datetime.setTime(time);
	        var year = datetime.getFullYear();
	        var month = (datetime.getMonth() + 1) < 10 ? "0" + (datetime.getMonth() + 1) : (datetime.getMonth() + 1);
	        var date = datetime.getDate() < 10 ? "0" + datetime.getDate() : datetime.getDate();
	        var hour = datetime.getHours() < 10 ? "0" + datetime.getHours() : datetime.getHours();
	        var minute = datetime.getMinutes() < 10 ? "0" + datetime.getMinutes() : datetime.getMinutes();
	        var second = datetime.getSeconds() < 10 ? "0" + datetime.getSeconds() : datetime.getSeconds();
	        // return year + "-" + month + "-" + date + " " + hour + ":" + minute + ":" + second;
	        return year + "-" + month + "-" + date + ' ' + hour + ':' + minute + ':' + second;
	      } else {
	        return "---";
	      }
	    }