JS获取周、月、季度日期

效果：

代码：

//用于获取日期本周、本月、本季度的js
//Author : guanghe
//文件引用方法：<script src="${staticPath}/common/js/dateUtil.js"></script>
/**
 * 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;

//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(theYear, theMonth) {
    var monthStartDate = new Date(theYear, theMonth, 1);
    var monthEndDate = new Date(theYear, theMonth + 1, 1);
    var days = (monthEndDate - monthStartDate) / (1000 * 60 * 60 * 24);
    return days;
}

//获得本季度的开始月份
function getQuarterStartMonth(theMonth) {
    if(!theMonth) {
        theMonth = nowMonth;
    }
    var quarterStartMonth = 0;
    if (theMonth < 3) {
        quarterStartMonth = 0;
    }
    if (2 < theMonth && theMonth < 6) {
        quarterStartMonth = 3;
    }
    if (5 < theMonth && theMonth < 9) {
        quarterStartMonth = 6;
    }
    if (theMonth > 8) {
        quarterStartMonth = 9;
    }
    return quarterStartMonth;
}

//获得本周的开始日期
function ghGetWeekStartDate() {
    var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek + 1);
    return formatDate(weekStartDate);
}
//获得本周的结束日期
function ghGetWeekEndDate() {
    var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek) + 1);
    return formatDate(weekEndDate);
}

//获得下周的开始日期
function ghGetNextWeekStartDate() {
    var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek + 7 + 1);
    return formatDate(weekStartDate);
}

//获得本月的开始日期
function ghGetMonthStartDate() {
    var monthStartDate = new Date(nowYear, nowMonth, 1);
    return formatDate(monthStartDate);
}

//获得本月的结束日期
function ghGetMonthEndDate() {
    var monthEndDate = new Date(nowYear, nowMonth, getMonthDays(nowYear, nowMonth));
    return formatDate(monthEndDate);
}

//获得下月开始时间
function ghGetNextMonthStartDate() {
    var theYear = nowYear;
    var theMonth = nowMonth + 1;
    if(theMonth == 12) {
        theYear += 1;
        theMonth = 0;
    }
    var nextMonthStartDate = new Date(theYear, theMonth, 1);
    return formatDate(nextMonthStartDate);
}

//获得本季度的开始日期
function ghGetQuarterStartDate() {
    var quarterStartDate = new Date(nowYear, getQuarterStartMonth(), 1);
    return formatDate(quarterStartDate);
}

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

function ghGetNextQuarterStartDate() {
    var theYear = nowYear;
    var theQuarterMonth = nowMonth + 3;
    if(theQuarterMonth > 11) {
        theYear += 1;
        theQuarterMonth -= 12;
    }
    var quarterStartDate = new Date(theYear, getQuarterStartMonth(theQuarterMonth), 1);
    return formatDate(quarterStartDate);
}

//设置查询时间
function ghSetDate(areaName, inputName, id) {
    var date = $(areaName).children(inputName);
    var dateStart = date.eq(0);
    var dateEnd = date.eq(1);
    switch(id) {
        case "cur_week" :
            dateStart.val(ghGetWeekStartDate());
            dateEnd.val(ghGetNextWeekStartDate());
            break;
        case "cur_month" :
            dateStart.val(ghGetMonthStartDate());
            dateEnd.val(ghGetNextMonthStartDate());
            break;
        case "cur_quarter" :
            dateStart.val(ghGetQuarterStartDate());
            dateEnd.val(ghGetNextQuarterStartDate());
            break;
    }
}

//初始化时间区域选择控件
// name：时间组件选择器name
function ghInitWidget(name) {
    var areaName = "#" + name + "_date";
    var inputName = "input[name='" + name + "']";
    var str = $("<label id='theLabel' class='control-label'><a id='cur_week'>本周</a>&emsp;<a id='cur_month'>本月</a>&emsp;<a id='cur_quarter'>本季度</a>&emsp;自定义&emsp;</label>");
    $(areaName).before(str);
    //点击区域按钮，高亮并搜索
    $("#theLabel a").click(function() {
        $("#theLabel a").css("color", "#337ab7");
        $(this).css("color", "red");
        ghSetDate(areaName, inputName, this.id);
        $(":button.btn-search1").click();
    });
    //点击日期框，区域选择按钮取消高亮
    $(areaName).children(inputName).click(function() {
        $("#theLabel a").css("color", "#337ab7");
    });
}