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1、 JavaScript 获取当前时间戳:
第一种:
var timestamp = Date.parse(new Date());
console.log(timestamp); // 1622427159000
第二种:
var timestamp = (new Date()).valueOf();
console.log(timestamp); // 1622427218359
第三种:
new Date().getTime() ; // 1622427445085
注:第一种:获取的时间戳是把毫秒改成000显示,第二种和第三种是获取了当前毫秒的时间戳。
2、指定时间转换时间戳
// 时间格式必须为 YYYY-MM-DD HH:MM:SS 或者 YYYY-MM-DD
let start_time = "2021-05-08 12:50:30";
new Date(start_time).getTime() // 使用上面三种均可以实现
// 1620449430000
3、 时间戳转换时间
function format(dataString)
{
//dataString是整数,否则要parseInt转换
var time = new Date(dataString);
var year = time.getFullYear();
var month = time.getMonth()+1;
var day = time.getDate();
var hour = time.getHours();
var minute = time.getMinutes();
var second = time.getSeconds();
return year+'-'+(month<10?'0'+month:month)+'-'+(day<10?'0'+day:day)+' '+(hour<10?'0'+hour:hour)+':'+(minute<10?'0'+minute:minute)+':'+(second<10?'0'+second:second)
}
format(1620449430000);
// "2021-05-08 12:50:30"
// 方法2 - 有ESlint校验的慎用
const created = "2020-08-07T09:42:20Z";
formatDate ( new Date(created ) )
// 日期处理
formatDate = (date) => {
let format = 'yyyy-MM-dd hh:mm:ss'
const args = {
"M+": date.getMonth() + 1,
"d+": date.getDate(),
"h+": date.getHours(),
"m+": date.getMinutes(),
"s+": date.getSeconds(),
"q+": Math.floor((date.getMonth() + 3) / 3), // quarter
"S": date.getMilliseconds()
};
if (/(y+)/.test(format))
format = format.replace(RegExp.$1, (date.getFullYear() + "").substr(4 - RegExp.$1.length));
for (const i in args) {
const n = args[i];
if (new RegExp("(" + i + ")").test(format))
format = format.replace(RegExp.$1, RegExp.$1.length == 1 ? n : ("00" + n).substr(("" + n).length));
}
return format;
}
4、Js获取当前日期时间及其它操作
var myDate = new Date();//获取系统当前时间
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
5、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
*/
// 案例代码如下:
// 判断闰年
Date.prototype.isLeapYear = function(){
return (0==this.getYear()%4&&((this.getYear()%100!=0)||(this.getYear()%400==0)));
}
/*
// 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;
}
/*
//| 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);
}
/*
//| 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());
}
}
/*
//| 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();
}
}
/*
//| 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;
}
/*
//| 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;
}
/*
//| 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;
}
/*
//| 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;
}
/*
//| 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;
}
/*
//| 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;
}
/*
//| 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;
}
/*
//| 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);
}
6、倒计时抽奖案例
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>简单易用的倒计时js代码 - 站长素材</title>
<style>
*{ margin:0; padding:0; list-style:none;}
body{ font-size:18px; text-align:center;}
.time{ height:30px; padding:200px;}
</style>
</head>
<body>
<div class="time">
<span id="t_d">00天</span>
<span id="t_h">00时</span>
<span id="t_m">00分</span>
<span id="t_s">00秒</span>
</div>
<script>
function GetRTime(){
//双十一倒计时抽奖
var EndTime= new Date('2018/11/11 00:00:00');
var NowTime = new Date();
var t =EndTime.getTime() - NowTime.getTime();
var d=Math.floor(t/1000/60/60/24);
var h=Math.floor(t/1000/60/60%24);
var m=Math.floor(t/1000/60%60);
var s=Math.floor(t/1000%60);
document.getElementById("t_d").innerHTML = d + "天";
document.getElementById("t_h").innerHTML = h + "时";
document.getElementById("t_m").innerHTML = m + "分";
document.getElementById("t_s").innerHTML = s + "秒";
}
setInterval(GetRTime,0);
</script>
</body>
</html>
原文链接:
https://blog.csdn.net/qq_37896578/article/details/90080953?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522162242671516780269858391%2522%252C%2522scm%2522%253A%252220140713.130102334…%2522%257D&request_id=162242671516780269858391&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2allsobaiduend~default-3-90080953.pc_search_result_control_group&utm_term=js%E8%8E%B7%E5%8F%96%E6%97%B6%E9%97%B4%E6%88%B3&spm=1018.2226.3001.4187
https://www.cnblogs.com/ShanHeDiao/p/4445012.html
https://tangce.blog.csdn.net/article/details/83787402?utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromMachineLearnPai2%7Edefault-1.control&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromMachineLearnPai2%7Edefault-1.control
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