/**
* 獲取本周、本季度、本月、上月的開始日期、結束日期
*/
var now = new Date(); //當前日期??
var nowDayOfWeek = now.getDay(); //今天本周的第幾天??
var nowDay = now.getDate(); //當前日??
var nowMonth = now.getMonth(); //當前月??
var nowYear = now.getYear(); //當前年??
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);??
}??

//獲得某月的天數??
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;??
}??

//獲得本季度的開始月份??
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;??
}??

//獲得本周的開始日期??
function getWeekStartDate() {??
var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek);??
return formatDate(weekStartDate);??
}??

//獲得本周的結束日期??
function getWeekEndDate() {??
var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek));??
return formatDate(weekEndDate);??
}??

//獲得本月的開始日期??
function getMonthStartDate(){??
var monthStartDate = new Date(nowYear, nowMonth, 1);??
return formatDate(monthStartDate);??
}??

//獲得本月的結束日期??
function getMonthEndDate(){??
var monthEndDate = new Date(nowYear, nowMonth, getMonthDays(nowMonth));??
return formatDate(monthEndDate);??
}?

//獲得上月開始時間
function getLastMonthStartDate(){
var lastMonthStartDate = new Date(nowYear, lastMonth, 1);
return formatDate(lastMonthStartDate);??
}

//獲得上月結束時間
function getLastMonthEndDate(){
var lastMonthEndDate = new Date(nowYear, lastMonth, getMonthDays(lastMonth));
return formatDate(lastMonthEndDate);??
}

//獲得本季度的開始日期??
function getQuarterStartDate(){??

var quarterStartDate = new Date(nowYear, getQuarterStartMonth(), 1);??
return formatDate(quarterStartDate);??
}??

//或的本季度的結束日期??
function getQuarterEndDate(){??
var quarterEndMonth = getQuarterStartMonth() + 2;??
var quarterStartDate = new Date(nowYear, quarterEndMonth, getMonthDays(quarterEndMonth));??
return formatDate(quarterStartDate);??
}

轉載于:https://www.cnblogs.com/zbuser/p/7921406.html

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