前言

虽然现在处理日期方面已经有了很成熟的也很好用的库，例如（momentjs和date-fns），但是在实际开发中，我们有时候可能并不需要整个库。所以我就在下面整理了在前端开发时对日期时间的各种操作，也算是比较全的了。其中一部分来自自己，还有一部分来源于我们万能的网友~

获取当前时间戳

var timestamp = Date.parse(new  Date()); //精确到秒var timestamp = (new Date()).valueOf();  //精确到毫秒var timestamp = new Date().getTime(); //精确到毫秒var timestamp = +new Date();var timestamp = Date.now();

获取指定时间戳

var timestamp = (new Date(" 2019/10/24 08:00:00")).getTime();var timestamp = (new Date(" 2019-10-24 08:00:00")).getTime();

获取当前时间的前一天/后一天的时间戳

var timestamp = +new Date() - 24*60*60*1000;var timestamp = +new Date() + 24*60*60*1000;

今日零点时间戳

var timestamp = new Date(new Date().toLocaleDateString()).getTime();

今日最晚时间 23:59:59的时间戳

let timestamp = new Date(new Date().toLocaleDateString()).getTime()+24*60*60*1000-1;

获取当前时间的n天后的时间戳

/** * @param {number} n 天数 * @returns {Number} 返回值为时间毫秒值 */function toNextTimes(n){    let timestamp = +new Date() + n * 86400000;    return timestamp;}

本周第一天

/*** *  @return {*} WeekFirstDay 返回本周第一天的时间 */function showWeekFirstDay(){    let Nowdate=new Date();    let WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);    return WeekFirstDay;}

本周最后一天

/*** *  @return {*} WeekLastDay 返回本周最后一天的时间 */function showWeekLastDay(){    let Nowdate=new Date();    let WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);    let WeekLastDay=new Date((WeekFirstDay/1000+6*86400)*1000);    return WeekLastDay;}

本月第一天

/*** *  @return {*} MonthFirstDay 返回本月第一天的时间 */function showMonthFirstDay(){    let Nowdate=new Date();    let MonthFirstDay=new Date(Nowdate.getFullYear(),Nowdate.getMonth());    return MonthFirstDay;}

本月最后一天

/*** *  @return {*} MonthLastDay 返回本月最后一天的时间 */function showMonthLastDay(){    let Nowdate=new Date();    let MonthNextFirstDay=new Date(Nowdate.getFullYear(),Nowdate.getMonth()+1);    let MonthLastDay=new Date(MonthNextFirstDay-86400000);    return MonthLastDay;}

日期转时间戳

/** * @param {String} time - 日期字符串，如'2018-8-8','2018,8,8','2018/8/8' * @returns {Number} 返回值为时间毫秒值 */function timeToTimestamp (time) {    let date = new Date(time);    let timestamp = date.getTime();    return timestamp;}

格式化当前时间

/*** *  @return {string} timeText 返回系统时间字符串 */function getdataTimeSec() {    let time = new Date();    let weekDay;    let year = time.getFullYear();    let month = time.getMonth() + 1;    let day = time.getDate();    //获取时分秒    let h = time.getHours();    let m = time.getMinutes();    let s = time.getSeconds();    //检查是否小于10    h = check(h);    m = check(m);    s = check(s);    let now_day = time.getDay();    switch (now_day) {        case 0: {            weekDay = "星期日"        }            break;        case 1: {            weekDay = "星期一"        }            break;        case 2: {            weekDay = "星期二"        }            break;        case 3: {            weekDay = "星期三"        }            break;        case 4: {            weekDay = "星期四"        }            break;        case 5: {            weekDay = "星期五"        }            break;        case 6: {            weekDay = "星期六"        }            break;        case 7: {            weekDay = "星期日"        }            break;    }    let timeText = year + "年" + month + "月" + day + "日  " + " " + weekDay + " " + h + ":" + m +":" + s;    return timeText}

返回指定时间戳之间的时间间隔

/** *  @param {*} startTime 开始时间的时间戳 *  @param {*} endTime 结束时间的时间戳 *  @return {string} str 返回时间字符串 */function getTimeInterval(startTime, endTime) {    let runTime = parseInt((endTime - startTime) / 1000);    let year = Math.floor(runTime / 86400 / 365);    runTime = runTime % (86400 * 365);    let month = Math.floor(runTime / 86400 / 30);    runTime = runTime % (86400 * 30);    let day = Math.floor(runTime / 86400);    runTime = runTime % 86400;    let hour = Math.floor(runTime / 3600);    runTime = runTime % 3600;    let minute = Math.floor(runTime / 60);    runTime = runTime % 60;    let second = runTime;    let str = '';    if (year > 0) {        str = year + '年';    }    if (year <= 0 && month > 0) {        str = month + '月';    }    if (year <= 0 && month <= 0 && day > 0) {        str = day + '天';    }    if (year <= 0 && month <= 0 && day <= 0 && hour > 0) {        str = hour + '小时';    }    if (year <= 0 && month <= 0 && day <= 0 && hour <= 0 && minute > 0) {        str = minute + '分钟';    }    if (year <= 0 && month <= 0 && day <= 0 && hour <= 0 && minute <= 0 && second > 0) {        str += second + '秒';    }    str += '前';    return str;}

按类型格式化日期

/** * @param {*} date 具体日期变量 * @param {string} dateType 需要返回类型 * @return {string} dateText 返回为指定格式的日期字符串 */function getFormatDate(date, dateType) {    let dateObj = new Date(date);    let month = dateObj.getMonth() + 1;    let strDate = dateObj.getDate();    let hours = dateObj.getHours();    let minutes = dateObj.getMinutes();    let seconds = dateObj.getSeconds();    if (month >= 1 && month <= 9) {        month = "0" + month;    }    if (strDate >= 0 && strDate <= 9) {        strDate = "0" + strDate;    }    if (hours >= 0 && hours <= 9) {        hours = "0" + hours    }    if (minutes >= 0 && minutes <= 9) {        minutes = "0" + minutes    }    if (seconds >= 0 && seconds <= 9) {        seconds = "0" + seconds    }    let dateText = dateObj.getFullYear() + '年' + (dateObj.getMonth() + 1) + '月' + dateObj.getDate() + '日';    if (dateType == "yyyy-mm-dd") {        dateText = dateObj.getFullYear() + '-' + (dateObj.getMonth() + 1) + '-' + dateObj.getDate();    }    if (dateType == "yyyy.mm.dd") {        dateText = dateObj.getFullYear() + '.' + (dateObj.getMonth() + 1) + '.' + dateObj.getDate();    }    if (dateType == "yyyy-mm-dd MM:mm:ss") {        dateText = dateObj.getFullYear() + '-' + month + '-' + strDate + ' ' + hours + ":" + minutes + ":" + seconds;    }    if (dateType == "mm-dd MM:mm:ss") {        dateText = month + '-' + strDate + ' ' + hours + ":" + minutes + ":" + seconds;    }    if (dateType == "yyyy年mm月dd日 MM:mm:ss") {        dateText = dateObj.getFullYear() + '年' + month + '月' + strDate + '日' + ' ' + hours + ":" + minutes + ":" + seconds;    }    return dateText; }

判断是否为闰年

/*** @param  {number} year 要判断的年份* @return {boolean} 返回布尔值*/function leapYear(year) {    return !(year % (year % 100 ? 4 : 400));}

返回两个年份之间的闰年

/*** @param  {number} start 开始年份* @param  {number} end 结束年份* @return {array}  arr 返回符合闰年的数组*/function leapYears(start, end) {    let arr = [];    for (var i=start; i<end; i++) {        if ( leapYear(i) ) {            arr.push(i)        }    }    return arr}

判断时间格式是否有效

/*** 短时间，如 (10:24:06)* @param  {string} str 需要验证的短时间* @return {boolean} 返回布尔值*/function isTime(str) {    var a = str.match(/^(\d{1,2})(:)?(\d{1,2})\2(\d{1,2})$/);    if (a == null) { return false; }    if (a[1] >= 24 || a[3] >= 60 || a[4] >= 60) {        return false    }    return true;}/*** 短日期，形如 (2019-10-24)* @param  {string} str 需要验证的短时间* @return {boolean} 返回布尔值*/function strDateTime(str){    var result = str.match(/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/);    if (result == null) return false;    var d = new Date(result[1], result[3] - 1, result[4]);    return (d.getFullYear() == result[1] && d.getMonth() + 1 == result[3] && d.getDate() == result[4]);}/*** 长日期时间，形如 (2019-10-24 10:24:06)* @param  {string} str 需要验证的短时间* @return {boolean} 返回布尔值*/function strDateTime(str){    var result = str.match(/^(\d{4})(-|\/)(\d{1,2})\2(\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2})$/);    if (result == null) return false;    var d = new Date(result[1], result[3] - 1, result[4], result[5], result[6], result[7]);    return (d.getFullYear() == result[1] && (d.getMonth() + 1) == result[3] && d.getDate() == result[4] && d.getHours() == result[5] && d.getMinutes() == result[6] && d.getSeconds() == result[7]);}

验证日期大小

/*** 例："2019-10-24" 和 "2019-10-25"* @param  {string} d1需要验证的日期1* @param  {string} d2需要验证的日期2* @return {boolean} 返回布尔值*/function compareDate(d1, d2) {    return ((new Date(d1.replace(/-/g, "\/"))) < (new Date(d2.replace(/-/g, "\/"))));}

验证一个日期是不是今天

/*** @param  {string} val 需要验证的日期* @return {boolean} 返回布尔值*/function isToday(val){    return new Date().toLocaleDateString() == new Date(val).toLocaleDateString();}

验证传入的日期是否是昨天

/*** @param  {string} val 需要验证的日期* @return {boolean} 返回布尔值*/function isYesterday(val) {    var today = new Date();    var yesterday = new Date(now - 1000 * 60 * 60 * 24);    var test = new Date(val);    if (yesterday.getYear() === test.getYear() && yesterday.getMonth() === test.getMonth() && yesterday.getDate() === test.getDate()) {        return true;    } else {        return false;    }}

设置几天后的日期

/*** @param  {string} date 起始日期* @param  {number} day 向后的天数* @return {string} 返回想要得到的日期*/function convertDate (date, day) {    let tempDate = new Date(date);    tempDate.setDate(tempDate.getDate()+day);    let Y = tempDate.getFullYear();    let M = tempDate.getMonth()+1 < 10 ? '0'+(tempDate.getMonth()+1) : tempDate.getMonth()+1;    let D = tempDate.getDate() < 10 ? '0'+(tempDate.getDate()) : tempDate.getDate();    let result = Y + "-" + M + "-" + D    return result;}