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);

}