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();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;
}写在最后
若上面函数有错误，或者还有工作中遇到，但是上面没有写到的，欢迎指出来~