Summary of time processing in JavaScript_javascript skills

function getNowTime() {
return new Date();
}

function getTimeAddDays(time, days) {
return new Date(time.getTime() + days * 24 * 60 * 60 * 1000);
}

function getFormatDate(time) {
return time.getFullYear() + "-" + (time.getMonth() + 1) + "-" + time.getDate();
}

function convertToDate(strings) {
return new Date(Date.parse(strings.replace("-", "/")));
}

var WEEKDAYS = ["周日", "周一", "周二", "周三", "周四", "周五", "周六"]; //星期
function getFormatWeek(time) {
return WEEKDAYS[time.getDay()];
}

function compareTime(time1, time2) {
return time1.getTime() - time2.getTime();
}

function getDays(time1, tiem2){
var day = 24*60*60*1000;
return (time1.getTime() - time2.getTime())/day;
}