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-DDlet start_time = "-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);// "-05-08 12:50:30"
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+$)/g,”); //去两边空格;if(sDate==”) return true;//如果格式满足YYYY-(/)MM-(/)DD或YYYY-(/)M-(/)DD或YYYY-(/)M-(/)D或YYYY-(/)MM-(/)D就替换为”//数据库中，合法日期可以是:YYYY-MM/DD(-3/21),数据库会自动转换为YYYY-MM-DD格式var s = sDate.replace(/[\d]{ 4,4 }[\-/]{ 1 }[\d]{ 1,2 }[\-/]{ 1 }[\d]{ 1,2 }/g,”);if (s==”) //说明格式满足YYYY-MM-DD或YYYY-M-DD或YYYY-M-D或YYYY-MM-D{var t=new Date(sDate.replace(/\-/g,’/'));var ar = sDate.split(/[-/:]/);if(ar[0] != t.getYear() || ar[1] != t.getMonth()+1 || ar[2] != t.getDate()){//alert(‘错误的日期格式！格式为：YYYY-MM-DD或YYYY/MM/DD。注意闰年。’);return false;}}else{//alert(‘错误的日期格式！格式为：YYYY-MM-DD或YYYY/MM/DD。注意闰年。’);return false;}return true;}/*//| 日期时间检查//| 格式为：YYYY-MM-DD HH:MM:SS*/function CheckDateTime(str){var reg = /^(\d+)-(\d{ 1,2 })-(\d{ 1,2 }) (\d{ 1,2 }):(\d{ 1,2 }):(\d{ 1,2 })$/;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:-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('/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>
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