javascript调用系统时间函数吗

var currentDate = new Date();
console.log(currentDate);

Tue Jun 15 2021 09:57:31 GMT+0800 (China Standard Time)

var currentDate = new Date();
var year = currentDate.getFullYear();
var month = currentDate.getMonth() + 1;
var day = currentDate.getDate();
console.log(year + "-" + month + "-" + day);

2021-6-15

var currentDate = new Date();
var hours = currentDate.getHours();
var minutes = currentDate.getMinutes();
var seconds = currentDate.getSeconds();
console.log(hours + ":" + minutes + ":" + seconds);

9:57:31