这篇文章主要介绍了js怎么获取本周、上周、本月、上月、本季度、上季度的开始结束日期,具有一定借鉴价值,感兴趣的朋友可以参考下,希望大家阅读完这篇文章之后大有收获,下面让小编带着大家一起了解一下。
JavaScript的作用是什么
1、能够嵌入动态文本于HTML页面。2、对浏览器事件做出响应。3、读写HTML元素。4、在数据被提交到服务器之前验证数据。5、检测访客的浏览器信息。6、控制cookies,包括创建和修改等。7、基于Node.js技术进行服务器端编程。
js 获取 本周、上周、本月、上月、本季度、上季度的开始结束日期
/**
* 获取本周、本季度、本月、上月的开始日期、结束日期
*/
var now = new Date(); //当前日期
var nowDayOfWeek = now.getDay(); //今天本周的第几天
var nowDay = now.getDate(); //当前日
var nowMonth = now.getMonth(); //当前月
var nowYear = now.getYear(); //当前年
nowYear += (nowYear < 2000) ? 1900 : 0; //
var lastMonthDate = new Date(); //上月日期
lastMonthDate.setDate(1);
lastMonthDate.setMonth(lastMonthDate.getMonth() - 1);
var lastYear = lastMonthDate.getYear();
var lastMonth = lastMonthDate.getMonth();
//格式化日期:yyyy-MM-dd
function formatDate(date) {
var myyear = date.getFullYear();
var mymonth = date.getMonth() + 1;
var myweekday = date.getDate();
if (mymonth < 10) {
mymonth = "0" + mymonth;
}
if (myweekday < 10) {
myweekday = "0" + myweekday;
}
return (myyear + "-" + mymonth + "-" + myweekday);
}
//获得某月的天数
function getMonthDays(myMonth) {
var monthStartDate = new Date(nowYear, myMonth, 1);
var monthEndDate = new Date(nowYear, myMonth + 1, 1);
var days = (monthEndDate - monthStartDate) / (1000 * 60 * 60 * 24);
return days;
}
//获得本季度的开始月份
function getQuarterStartMonth() {
var quarterStartMonth = 0;
if (nowMonth < 3) {
quarterStartMonth = 0;
}
if (2 < nowMonth && nowMonth < 6) {
quarterStartMonth = 3;
}
if (5 < nowMonth && nowMonth < 9) {
quarterStartMonth = 6;
}
if (nowMonth > 8) {
quarterStartMonth = 9;
}
return quarterStartMonth;
}
//获得本周的开始日期
function getWeekStartDate() {
var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek);
return formatDate(weekStartDate);
}
//获得本周的结束日期
function getWeekEndDate() {
var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek));
return formatDate(weekEndDate);
}
//获得上周的开始日期
function getLastWeekStartDate() {
var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek - 7);
return formatDate(weekStartDate);
}
//获得上周的结束日期
function getLastWeekEndDate() {
var weekEndDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek - 1);
return formatDate(weekEndDate);
}
//获得本月的开始日期
function getMonthStartDate() {
var monthStartDate = new Date(nowYear, nowMonth, 1);
return formatDate(monthStartDate);
}
//获得本月的结束日期
function getMonthEndDate() {
var monthEndDate = new Date(nowYear, nowMonth, getMonthDays(nowMonth));
return formatDate(monthEndDate);
}
//获得上月开始时间
function getLastMonthStartDate() {
var lastMonthStartDate = new Date(nowYear, lastMonth, 1);
return formatDate(lastMonthStartDate);
}
//获得上月结束时间
function getLastMonthEndDate() {
var lastMonthEndDate = new Date(nowYear, lastMonth, getMonthDays(lastMonth));
return formatDate(lastMonthEndDate);
}
//获得本季度的开始日期
function getQuarterStartDate() {
var quarterStartDate = new Date(nowYear, getQuarterStartMonth(), 1);
return formatDate(quarterStartDate);
}
//或的本季度的结束日期
function getQuarterEndDate() {
var quarterEndMonth = getQuarterStartMonth() + 2;
var quarterStartDate = new Date(nowYear, quarterEndMonth,
getMonthDays(quarterEndMonth));
return formatDate(quarterStartDate);
}
js 计算月/周的第一天和最后一天
因为项目开发中遇到需要向后台传本周的开始和结束时间,以及上一周的起止时间,就琢磨了半天,总算写出来一套,写篇文章是为了方便自己记忆,也是分享给需要的人,水平有限,写的不好请见谅:
getDateStr3函数是为了把时间对象转变为yy-mm-dd的字符串,方便传值;
getWeekStartAndEnd函数是获取周的起止时间,并且用getDateStr3转换成字符串放到数组中,其中参数0代表当前周,-1代表前一周,-2代表上上周,以此类推,反过来也可以1代表下一周;
getMonthStartAndEnd函数是获取月的起止时间,传参同上
//获取当前日期yy-mm-dd
//date 为时间对象
function getDateStr3(date) {
var year = "";
var month = "";
var day = "";
var now = date;
year = ""+now.getFullYear();
if((now.getMonth()+1)<10){
month = "0"+(now.getMonth()+1);
}else{
month = ""+(now.getMonth()+1);
}
if((now.getDate())<10){
day = "0"+(now.getDate());
}else{
day = ""+(now.getDate());
}
return year+"-"+month+"-"+day;
}
/**
* 获得相对当前周AddWeekCount个周的起止日期
* AddWeekCount为0代表当前周 为-1代表上一个周 为1代表下一个周以此类推
* **/
function getWeekStartAndEnd(AddWeekCount) {
//起止日期数组
var startStop = new Array();
//一天的毫秒数
var millisecond = 1000 * 60 * 60 * 24;
//获取当前时间
var currentDate = new Date();
//相对于当前日期AddWeekCount个周的日期
currentDate = new Date(currentDate.getTime() + (millisecond * 7*AddWeekCount));
//返回date是一周中的某一天
var week = currentDate.getDay();
//返回date是一个月中的某一天
var month = currentDate.getDate();
//减去的天数
var minusDay = week != 0 ? week - 1 : 6;
//获得当前周的第一天
var currentWeekFirstDay = new Date(currentDate.getTime() - (millisecond * minusDay));
//获得当前周的最后一天
var currentWeekLastDay = new Date(currentWeekFirstDay.getTime() + (millisecond * 6));
//添加至数组
startStop.push(getDateStr3(currentWeekFirstDay));
startStop.push(getDateStr3(currentWeekLastDay));
return startStop;
}
/**
* 获得相对当月AddMonthCount个月的起止日期
* AddMonthCount为0 代表当月 为-1代表上一个月 为1代表下一个月 以此类推
* ***/
function getMonthStartAndEnd(AddMonthCount) {
//起止日期数组
var startStop = new Array();
//获取当前时间
var currentDate = new Date();
var month=currentDate.getMonth()+AddMonthCount;
if(month<0){
var n = parseInt((-month)/12);
month += n*12;
currentDate.setFullYear(currentDate.getFullYear()-n);
}
currentDate = new Date(currentDate.setMonth(month));
//获得当前月份0-11
var currentMonth = currentDate.getMonth();
//获得当前年份4位年
var currentYear = currentDate.getFullYear();
//获得上一个月的第一天
var currentMonthFirstDay = new Date(currentYear, currentMonth,1);
//获得上一月的最后一天
var currentMonthLastDay = new Date(currentYear, currentMonth+1, 0);
//添加至数组
startStop.push(getDateStr3(currentMonthFirstDay));
startStop.push(getDateStr3(currentMonthLastDay));
//返回
return startStop;
}
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