虽然现今处理日期方面早已有了很成熟的也挺好用的库，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。
所以我就在下边整理了在后端开发时对日期时间的各类操作，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();
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/后三天的时间戳
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;}
本周最后三天
/**** @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;}
本月最后三天
/**** @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10h = 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;}
按类型低格日期
/*** @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;}
判断是否为闰月
/*** @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月
/*** @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; iif ( 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明天
/*** @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今天
/*** @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 + "-" + Dreturn result;}
写在最后
若前面函数有错误，或者还有工作中遇见，但是里面没有讲到的，欢迎指下来~
