因为用到JS倒计时,所以就把网上搜到的各种关于日期的整理了一下,有个印象,以后再用到,可以直接看自己的,方便很多。
var myDate = new Date();
以下都是在myDate的基础上得到的。
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
获取当前年份返回的三位数其实是当前年份减去1900年所获得的数值;如下图:
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
js代码:
- 判断闰年
Date.prototype.isLeapYear = function() {
return (0==this.getYear()%4&&((this.getYear()%100!=0)||(this.getYear()%400==0)));
}
2.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;
}
3.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;
}
7.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;
}
10.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;
}
11.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;
}
12.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;
}
13.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);
}
格式化函数:
取时间(2020-9-4 15:54:00)可用于数据库date型
export function getDateTime(){
let tmp = new Date();
let str = tmp.getFullYear()+'-'+tmp.getMonth()+'-'+tmp.getDate()+' '+tmp.getHours()+':'+tmp.getMinutes()+':'+tmp.getSeconds()
return str
}
取日期,可以设定每天几点进行改变,比如设定每天的20点更改日期,用于前台展示。
//取当天日期(以20点为界限,以后记得放在全局变量里面,change是修改天数,为int型)
//date_tmp是计算值,如:计算2020年1月1日的昨天:this.getDate(-1,"2020-01-01");
export function getDate(change = 0, date_tmp = "") {
// console.log("getdate started!")
if (change === 0) {
let tmp = new Date();
let date;
if (tmp.getHours() < '0') {
//---------------在这里改时限if (tmp.getHours() < '18')
date = tmp.getFullYear() + '-' + (tmp.getMonth() + 1) + '-' + (tmp.getDate() - 1);
} else {
date = tmp.getFullYear() + '-' + (tmp.getMonth() + 1) + '-' + tmp.getDate();
// console.log(date);
}
return date;
} else {
let today_tmp;
if (date_tmp != "") {
today_tmp = date_tmp + " 00:00:00";
} else {
today_tmp = this.getDate() + " 00:00:00";
}
let today = new Date(today_tmp);
let nowTime = today.getTime();
let ms = 24 * 3600 * 1000 * change;
today.setTime(parseInt(nowTime + ms));
let oYear = today.getFullYear();
let oMoth = (today.getMonth() + 1).toString();
if (oMoth.length <= 1) oMoth = '0' + oMoth;
let oDay = today.getDate().toString();
if (oDay.length <= 1) oDay = '0' + oDay;
return oYear + '-' + oMoth + '-' + oDay;
}
// console.log(date);
}