JS格式化时间

//格式化时间
function format(dat){
    //获取年月日，时间
    var year = dat.getFullYear();
    var mon = (dat.getMonth()+1) < 10 ? "0"+(dat.getMonth()+1) : dat.getMonth()+1;
    var data = dat.getDate()  < 10 ? "0"+(dat.getDate()) : dat.getDate();
    var hour = dat.getHours()  < 10 ? "0"+(dat.getHours()) : dat.getHours();
    var min =  dat.getMinutes()  < 10 ? "0"+(dat.getMinutes()) : dat.getMinutes();
    var seon = dat.getSeconds() < 10 ? "0"+(dat.getSeconds()) : dat.getSeconds();
				
    var newDate = year +"-"+ mon +"-"+ data +" "+ hour +":"+ min +":"+ seon;
    return newDate;
}

//获取时间
var dat = new Date();	
//格式化时间
var newDate = format(dat);

/**
 * 格式化日期
 * @param {string | number | Date} value 指定日期
 * @param {string} format 格式化的规则
 * @example
 * ```js
 * formatDate();
 * formatDate(1603264465956);
 * formatDate(1603264465956, "h:m:s");
 * formatDate(1603264465956, "Y年M月D日");
 * ```
 */
function formatDate(value = Date.now(), format = "Y-M-D h:m:s") {
    const formatNumber = n => `0${n}`.slice(-2);
    const date = new Date(value);
    const formatList = ["Y", "M", "D", "h", "m", "s"];
    const resultList = [];
    resultList.push(date.getFullYear().toString());
    resultList.push(formatNumber(date.getMonth() + 1));
    resultList.push(formatNumber(date.getDate()));
    resultList.push(formatNumber(date.getHours()));
    resultList.push(formatNumber(date.getMinutes()));
    resultList.push(formatNumber(date.getSeconds()));
    for (let i = 0; i < resultList.length; i++) {
        format = format.replace(formatList[i], resultList[i]);
    }
    return format;
}

function getNowFormatDate() {
    var date = new Date();
     
    var year = date.getFullYear();
    var month = date.getMonth() + 1;
    var d = date.getDate();
    var hour = date.getHours();
    var minute = date.getMinutes();
    var second = date.getSeconds();
     
    if(month<10){
        month = "0" + month;
    }
     
    if(d<10){
        d = "0" + d;
    }
     
    if(hour<10){
        hour = "0" + hour;
    }
     
    if(minute<10){
        minute = "0" + hour;
    }
     
    if(second<10){
        second = "0" + second;
    }
     
    return year + "-" + month + "-" + d + " " +hour + ":" + minute + ":" + second;
}

// 对Date的扩展，将 Date 转化为指定格式的String
// 月(M)、日(d)、小时(h)、分(m)、秒(s)、季度(q) 可以用 1-2 个占位符， 
// 年(y)可以用 1-4 个占位符，毫秒(S)只能用 1 个占位符(是 1-3 位的数字) 
// 例子： 
// (new Date()).Format("yyyy-MM-dd hh:mm:ss.S") ==> 2006-07-02 08:09:04.423 
// (new Date()).Format("yyyy-M-d h:m:s.S")      ==> 2006-7-2 8:9:4.18 
Date.prototype.Format = function (fmt) { //author: meizz 
    var o = {
        "M+": this.getMonth() + 1, //月份 
        "d+": this.getDate(), //日 
        "h+": this.getHours(), //小时 
        "m+": this.getMinutes(), //分 
        "s+": this.getSeconds(), //秒 
        "q+": Math.floor((this.getMonth() + 3) / 3), //季度 
        "S": this.getMilliseconds() //毫秒 
    };
    if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    for (var k in o)
    if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
    return fmt;
}

 $(document).ready(function(){
    //给时间控件加上样式
     $("#tb").find("input[name='cruMon_begin']").attr("class","Wdate").click(function(){WdatePicker({dateFmt:'yyyy-MM'});});
     $("#tb").find("input[name='cruMon_end']").attr("class","Wdate").click(function(){WdatePicker({dateFmt:'yyyy-MM'});});
     $("#tb").find("input[name='cruMon_begin']").attr("value",new Date().Format("yyyy-MM"));
     $("#tb").find("input[name='cruMon_end']").attr("value",new Date().Format("yyyy-MM"));
 });

Date.prototype.format = function(format) {
    var o = {
        "M+": this.getMonth() + 1, //month  
        "d+": this.getDate(), //day  
        "h+": this.getHours(), //hour  
        "m+": this.getMinutes(), //minute  
        "s+": this.getSeconds(), //second  
        "q+": Math.floor((this.getMonth() + 3) / 3), //quarter  
        "S": this.getMilliseconds() //millisecond  
    }
    if (/(y+)/.test(format)) format = format.replace(RegExp.$1,
        (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    for (var k in o)
        if (new RegExp("(" + k + ")").test(format))
            format = format.replace(RegExp.$1,
                RegExp.$1.length == 1 ? o[k] :
                ("00" + o[k]).substr(("" + o[k]).length));
    return format;
}