JS获取日期(年/月/日/时/分/秒)&格式转化——带格式化函数

因为用到JS倒计时,所以就把网上搜到的各种关于日期的整理了一下,有个印象,以后再用到,可以直接看自己的,方便很多。

var myDate = new Date();

以下都是在myDate的基础上得到的。

myDate.getYear();        //获取当前年份(2位)
myDate.getFullYear();    //获取完整的年份(4位,1970-????)
myDate.getMonth();       //获取当前月份(0-11,0代表1月)
myDate.getDate();        //获取当前日(1-31)
myDate.getDay();         //获取当前星期X(0-6,0代表星期天)
myDate.getTime();        //获取当前时间(从1970.1.1开始的毫秒数)
myDate.getHours();       //获取当前小时数(0-23)
myDate.getMinutes();     //获取当前分钟数(0-59)
myDate.getSeconds();     //获取当前秒数(0-59)
myDate.getMilliseconds();    //获取当前毫秒数(0-999)
myDate.toLocaleDateString();     //获取当前日期
var mytime=myDate.toLocaleTimeString();     //获取当前时间
myDate.toLocaleString( );        //获取日期与时间

获取当前年份返回的三位数其实是当前年份减去1900年所获得的数值;如下图:
在这里插入图片描述

日期时间脚本库方法列表

Date.prototype.isLeapYear  //判断闰年
Date.prototype.Format    //日期格式化
Date.prototype.DateAdd   //日期计算
Date.prototype.DateDiff  //比较日期差
Date.prototype.toString  //日期转字符串
Date.prototype.toArray   //日期分割为数组
Date.prototype.DatePart  //取日期的部分信息
Date.prototype.MaxDayOfDate //取日期所在月的最大天数
Date.prototype.WeekNumOfYear //判断日期所在年的第几周
StringToDate   //字符串转日期型
IsValidDate    //验证日期有效性
CheckDateTime  //完整日期时间检查
daysBetween    //日期天数差

js代码:

  1. 判断闰年
Date.prototype.isLeapYear = function() {
    
       
    return (0==this.getYear()%4&&((this.getYear()%100!=0)||(this.getYear()%400==0)));   
}   

2.日期格式化

/** 格式 YYYY/yyyy/YY/yy 表示年份  
  * MM/M 月份  
  * W/w 星期  
  * dd/DD/d/D 日期  
  * hh/HH/h/H 时间  
  * mm/m 分钟  
  * ss/SS/s/S 秒  
**/
//---------------------------------------------------  
Date.prototype.Format = function(formatStr)  {
    
       
    var str = formatStr;   
    var Week = ['日','一','二','三','四','五','六'];  
  
    str=str.replace(/yyyy|YYYY/,this.getFullYear());   
    str=str.replace(/yy|YY/,(this.getYear() % 100)>9?(this.getYear() % 100).toString():'0' + (this.getYear() % 100));   
  
    str=str.replace(/MM/,this.getMonth()>9?this.getMonth().toString():'0' + this.getMonth());   
    str=str.replace(/M/g,this.getMonth());   
 
 
    str=str.replace(/w|W/g,Week[this.getDay()]);   
  
    str=str.replace(/dd|DD/,this.getDate()>9?this.getDate().toString():'0' + this.getDate());   
    str=str.replace(/d|D/g,this.getDate());   
  
    str=str.replace(/hh|HH/,this.getHours()>9?this.getHours().toString():'0' + this.getHours());   
    str=str.replace(/h|H/g,this.getHours());   
    str=str.replace(/mm/,this.getMinutes()>9?this.getMinutes().toString():'0' + this.getMinutes());   
    str=str.replace(/m/g,this.getMinutes());   
  
    str=str.replace(/ss|SS/,this.getSeconds()>9?this.getSeconds().toString():'0' + this.getSeconds());   
    str=str.replace(/s|S/g,this.getSeconds());   
  
    return str;   
}   

3.求两个时间的天数差 日期格式为 YYYY-MM-dd

function daysBetween(DateOne,DateTwo)  {
    
       
    var OneMonth = DateOne.substring(5,DateOne.lastIndexOf ('-'));  
    var OneDay = DateOne.substring(DateOne.length,DateOne.lastIndexOf ('-')+1);  
    var OneYear = DateOne.substring(0,DateOne.indexOf ('-'));  
  
    var TwoMonth = DateTwo.substring(5,DateTwo.lastIndexOf ('-'));  
    var TwoDay = DateTwo.substring(DateTwo.length,DateTwo.lastIndexOf ('-')+1);  
    var TwoYear = DateTwo.substring(0,DateTwo.indexOf ('-'));  
  
    var cha=((Date.parse(OneMonth+'/'+OneDay+'/'+OneYear)- Date.parse(TwoMonth+'/'+TwoDay+'/'+TwoYear))/86400000);   
    return Math.abs(cha);  
}  
  1. 日期计算
Date.prototype.DateAdd = function(strInterval, Number) {
    
       
    var dtTmp = this;  
    switch (strInterval) {
    
       
        case 's' :return new Date(Date.parse(dtTmp) + (1000 * Number));  
        case 'n' :return new Date(Date.parse(dtTmp) + (60000 * Number));  
        case 'h' :return new Date(Date.parse(dtTmp) + (3600000 * Number));  
        case 'd' :return new Date(Date.parse(dtTmp) + (86400000 * Number));  
        case 'w' :return new Date(Date.parse(dtTmp) + ((86400000 * 7) * Number));  
        case 'q' :return new Date(dtTmp.getFullYear(), (dtTmp.getMonth()) + Number*3, dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds());  
        case 'm' :return new Date(dtTmp.getFullYear(), (dtTmp.getMonth()) + Number, dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds());  
        case 'y' :return new Date((dtTmp.getFullYear() + Number), dtTmp.getMonth(), dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds());  
    }  
}  
  1. 比较日期差 dtEnd 格式为日期型或者有效日期格式字符串
Date.prototype.DateDiff = function(strInterval, dtEnd) {
    
       
    var dtStart = this;  
    if (typeof dtEnd == 'string' )//如果是字符串转换为日期型  
    {
    
       
        dtEnd = StringToDate(dtEnd);  
    }  
    switch (strInterval) {
    
       
        case 's' :return parseInt((dtEnd - dtStart) / 1000);  
        case 'n' :return parseInt((dtEnd - dtStart) / 60000);  
        case 'h' :return parseInt((dtEnd - dtStart) / 3600000);  
        case 'd' :return parseInt((dtEnd - dtStart) / 86400000);  
        case 'w' :return parseInt((dtEnd - dtStart) / (86400000 * 7));  
        case 'm' :return (dtEnd.getMonth()+1)+((dtEnd.getFullYear()-dtStart.getFullYear())*12) - (dtStart.getMonth()+1);  
        case 'y' :return dtEnd.getFullYear() - dtStart.getFullYear();  
    }  
}  
  1. 日期输出字符串,重载了系统的toString方法
Date.prototype.toString = function(showWeek)  
{
    
       
    var myDate= this;  
    var str = myDate.toLocaleDateString();  
    if (showWeek)  
    {
    
       
        var Week = ['日','一','二','三','四','五','六'];  
        str += ' 星期' + Week[myDate.getDay()];  
    }  
    return str;  
}  

7.日期合法性验证 (格式为:YYYY-MM-DD或YYYY/MM/DD )

function IsValidDate(DateStr)   {
    
       
    var sDate=DateStr.replace(/(^\s+|\s+$)/g,''); //去两边空格;   
    if(sDate=='') return true;   
    //  如果格式满足YYYY-(/)MM-(/)DD或YYYY-(/)M-(/)DD或YYYY-(/)M-(/)D或YYYY-(/)MM-(/)D就替换为''   
    //  数据库中,合法日期可以是:YYYY-MM/DD(2003-3/21),数据库会自动转换为YYYY-MM-DD格式   
    var s = sDate.replace(/[\d]{
    
     4,4 }[\-/]{
    
     1 }[\d]{
    
     1,2 }[\-/]{
    
     1 }[\d]{
    
     1,2 }/g,'');   
    if (s=='') {
    
      //说明格式满足YYYY-MM-DD或YYYY-M-DD或YYYY-M-D或YYYY-MM-D   
        var t=new Date(sDate.replace(/\-/g,'/'));   
        var ar = sDate.split(/[-/:]/);   
        if(ar[0] != t.getYear() || ar[1] != t.getMonth()+1 || ar[2] != t.getDate())   
        {
    
       
            //alert('错误的日期格式!格式为:YYYY-MM-DD或YYYY/MM/DD。注意闰年。');   
            return false;   
        }   
    }   
    else   
    {
    
       
        //alert('错误的日期格式!格式为:YYYY-MM-DD或YYYY/MM/DD。注意闰年。');   
        return false;   
    }   
    return true;   
}   
  1. 日期时间检查 ( 格式为:YYYY-MM-DD HH:MM:SS )
function CheckDateTime(str)  {
    
       
    var reg = /^(\d+)-(\d{
    
     1,2 })-(\d{
    
     1,2 }) (\d{
    
     1,2 }):(\d{
    
     1,2 }):(\d{
    
     1,2 })$/;   
    var r = str.match(reg);   
    if(r==null)return false;   
    r[2]=r[2]-1;   
    var d= new Date(r[1],r[2],r[3],r[4],r[5],r[6]);   
    if(d.getFullYear()!=r[1])return false;   
    if(d.getMonth()!=r[2])return false;   
    if(d.getDate()!=r[3])return false;   
    if(d.getHours()!=r[4])return false;   
    if(d.getMinutes()!=r[5])return false;   
    if(d.getSeconds()!=r[6])return false;   
    return true;   
}   
  1. 把日期分割成数组
Date.prototype.toArray = function()  {
    
       
    var myDate = this;  
    var myArray = Array();  
    myArray[0] = myDate.getFullYear();  
    myArray[1] = myDate.getMonth();  
    myArray[2] = myDate.getDate();  
    myArray[3] = myDate.getHours();  
    myArray[4] = myDate.getMinutes();  
    myArray[5] = myDate.getSeconds();  
    return myArray;  
}  

10.取得日期数据信息

//| 参数 interval 表示数据类型  
//| y 年 m月 d日 w星期 ww周 h时 n分 s秒  
  
Date.prototype.DatePart = function(interval)  {
    
       
    var myDate = this;  
    var partStr='';  
    var Week = ['日','一','二','三','四','五','六'];  
    switch (interval)  
    {
    
       
        case 'y' :partStr = myDate.getFullYear();break;  
        case 'm' :partStr = myDate.getMonth()+1;break;  
        case 'd' :partStr = myDate.getDate();break;  
        case 'w' :partStr = Week[myDate.getDay()];break;  
        case 'ww' :partStr = myDate.WeekNumOfYear();break;  
        case 'h' :partStr = myDate.getHours();break;  
        case 'n' :partStr = myDate.getMinutes();break;  
        case 's' :partStr = myDate.getSeconds();break;  
    }  
    return partStr;  
}  

11.取得当前日期所在月的最大天数

Date.prototype.MaxDayOfDate = function()  {
    
       
    var myDate = this;  
    var ary = myDate.toArray();  
    var date1 = (new Date(ary[0],ary[1]+1,1));  
    var date2 = date1.dateAdd(1,'m',1);  
    var result = dateDiff(date1.Format('yyyy-MM-dd'),date2.Format('yyyy-MM-dd'));  
    return result;  
}  

12.取得当前日期所在周是一年中的第几周

Date.prototype.WeekNumOfYear = function()  {
    
       
    var myDate = this;  
    var ary = myDate.toArray();  
    var year = ary[0];  
    var month = ary[1]+1;  
    var day = ary[2];  
    document.write('< script language=VBScript\> \n');  
    document.write('myDate = Datue(''+month+'-'+day+'-'+year+'') \n');  
    document.write('result = DatePart('ww', myDate) \n');  
    document.write(' \n');  
    return result;  
}  

13.字符串转成日期类型 ( 格式 MM/dd/YYYY MM-dd-YYYY YYYY/MM/dd YYYY-MM-dd )

function StringToDate(DateStr)  {
    
       
    var converted = Date.parse(DateStr);  
    var myDate = new Date(converted);  
    if (isNaN(myDate))  
    {
    
       
        //var delimCahar = DateStr.indexOf('/')!=-1?'/':'-';  
        var arys= DateStr.split('-');  
        myDate = new Date(arys[0],--arys[1],arys[2]);  
    }  
    return myDate;  
}  
 

// 若要显示:当前日期加时间(如:2009-06-12 12:00)

function CurentTime()
    {
    
     
        var now = new Date();
       
        var year = now.getFullYear();       //年
        var month = now.getMonth() + 1;     //月
        var day = now.getDate();            //日
       
        var hh = now.getHours();            //时
        var mm = now.getMinutes();          //分
       
        var clock = year + "-";       
        if(month < 10)
            clock += "0";       
        clock += month + "-";       
        if(day < 10)
            clock += "0";        
        clock += day + " ";       
        if(hh < 10)
            clock += "0";           
        clock += hh + ":";
        if (mm < 10) clock += '0'; 
        clock += mm; 
        return(clock); 
    } 
 

格式化函数:

取时间(2020-9-4 15:54:00)可用于数据库date型

export function getDateTime(){
    
    
  let tmp = new Date();
  let str = tmp.getFullYear()+'-'+tmp.getMonth()+'-'+tmp.getDate()+' '+tmp.getHours()+':'+tmp.getMinutes()+':'+tmp.getSeconds()

  return str
}

取日期,可以设定每天几点进行改变,比如设定每天的20点更改日期,用于前台展示。

//取当天日期(以20点为界限,以后记得放在全局变量里面,change是修改天数,为int型)
//date_tmp是计算值,如:计算2020年1月1日的昨天:this.getDate(-1,"2020-01-01");
export function getDate(change = 0, date_tmp = "") {
    
    
  // console.log("getdate started!")
  if (change === 0) {
    
    
    let tmp = new Date();

    let date;
    if (tmp.getHours() < '0') {
    
    //---------------在这里改时限if (tmp.getHours() < '18')
      date = tmp.getFullYear() + '-' + (tmp.getMonth() + 1) + '-' + (tmp.getDate() - 1);
    } else {
    
    
      date = tmp.getFullYear() + '-' + (tmp.getMonth() + 1) + '-' + tmp.getDate();
      // console.log(date);
    }
    return date;
  } else {
    
    
    let today_tmp;
    if (date_tmp != "") {
    
    
      today_tmp = date_tmp + " 00:00:00";
    } else {
    
    
      today_tmp = this.getDate() + " 00:00:00";
    }
    let today = new Date(today_tmp);
    let nowTime = today.getTime();
    let ms = 24 * 3600 * 1000 * change;
    today.setTime(parseInt(nowTime + ms));
    let oYear = today.getFullYear();
    let oMoth = (today.getMonth() + 1).toString();
    if (oMoth.length <= 1) oMoth = '0' + oMoth;
    let oDay = today.getDate().toString();
    if (oDay.length <= 1) oDay = '0' + oDay;
    return oYear + '-' + oMoth + '-' + oDay;
  }
  // console.log(date);
}

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转载自blog.csdn.net/wwppp987/article/details/108405559