JavaScript实现Select选择本周、上周、本季、上季、本年的时间选取

        //转自http://blog.csdn.net/xc_young/article/details/16878849，其上季度有错误，已修改
        var MrYangUtil = function () {

            this.getCurrentDate = function () {
                return new Date();
            };

            this.getCurrentWeek = function () {
                //起止日期数组  
                var startStop = new Array();
                //获取当前时间  
                var currentDate = this.getCurrentDate();
                //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();
                //一天的毫秒数  
                var millisecond = 1000 * 60 * 60 * 24;
                //减去的天数  
                var minusDay = week != 0 ? week - 1 : 6;
                //alert(minusDay);  
                //本周 周一  
                var monday = new Date(currentDate.getTime() - (minusDay * millisecond));
                //本周 周日  
                var sunday = new Date(monday.getTime() + (6 * millisecond));
                //添加本周时间  
                startStop.push(monday);//本周起始时间  
                //添加本周最后一天时间  
                startStop.push(sunday);//本周终止时间  
                //返回  
                return startStop;
            };

            this.getCurrentMonth = function () {
                //起止日期数组  
                var startStop = new Array();
                //获取当前时间  
                var currentDate = this.getCurrentDate();
                //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();
                //求出本月第一天  
                var firstDay = new Date(currentYear, currentMonth, 1);
                //当为12月的时候年份需要加1  
                //月份需要更新为0 也就是下一年的第一个月  
                if (currentMonth == 11) {
                    currentYear++;
                    currentMonth = 0;//就为  
                } else {
                    //否则只是月份增加,以便求的下一月的第一天  
                    currentMonth++;
                }
                //一天的毫秒数  
                var millisecond = 1000 * 60 * 60 * 24;
                //下月的第一天  
                var nextMonthDayOne = new Date(currentYear, currentMonth, 1);
                //求出上月的最后一天  
                var lastDay = new Date(nextMonthDayOne.getTime() - millisecond);
                //添加至数组中返回  
                startStop.push(firstDay);
                startStop.push(lastDay);
                //返回  
                return startStop;
            };

            this.getQuarterSeasonStartMonth = function (month) {
                var quarterMonthStart = 0;
                var spring = 0; //春  
                var summer = 3; //夏  
                var fall = 6;   //秋  
                var winter = 9;//冬  
                //月份从0-11  
                if (month < 3) {
                    return spring;
                }
                if (month < 6) {
                    return summer;
                }
                if (month < 9) {
                    return fall;
                }
                return winter;
            };

            this.getMonthDays = function (year, month) {
                //本月第一天 1-31  
                var relativeDate = new Date(year, month, 1);
                //获得当前月份0-11  
                var relativeMonth = relativeDate.getMonth();
                //获得当前年份4位年  
                var relativeYear = relativeDate.getFullYear();
                //当为12月的时候年份需要加1  
                //月份需要更新为0 也就是下一年的第一个月  
                if (relativeMonth == 11) {
                    relativeYear++;
                    relativeMonth = 0;
                } else {
                    //否则只是月份增加,以便求的下一月的第一天  
                    relativeMonth++;
                }
                //一天的毫秒数  
                var millisecond = 1000 * 60 * 60 * 24;
                //下月的第一天  
                var nextMonthDayOne = new Date(relativeYear, relativeMonth, 1);
                //返回得到上月的最后一天,也就是本月总天数  
                return new Date(nextMonthDayOne.getTime() - millisecond).getDate();
            };

            this.getCurrentSeason = function () {
                //起止日期数组  
                var startStop = new Array();
                //获取当前时间  
                var currentDate = this.getCurrentDate();
                //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();
                //获得本季度开始月份  
                var quarterSeasonStartMonth = this.getQuarterSeasonStartMonth(currentMonth);
                //获得本季度结束月份  
                var quarterSeasonEndMonth = quarterSeasonStartMonth + 2;
                //获得本季度开始的日期  
                var quarterSeasonStartDate = new Date(currentYear, quarterSeasonStartMonth, 1);
                //获得本季度结束的日期  
                var quarterSeasonEndDate = new Date(currentYear, quarterSeasonEndMonth, this.getMonthDays(currentYear, quarterSeasonEndMonth));
                //加入数组返回  
                startStop.push(quarterSeasonStartDate);
                startStop.push(quarterSeasonEndDate);
                //返回  
                return startStop;
            };

            this.getCurrentYear = function () {
                //起止日期数组  
                var startStop = new Array();
                //获取当前时间  
                var currentDate = this.getCurrentDate();
                //获得当前年份4位年  
                var currentYear = currentDate.getFullYear();
                //本年第一天  
                var currentYearFirstDate = new Date(currentYear, 0, 1);
                //本年最后一天  
                var currentYearLastDate = new Date(currentYear, 11, 31);
                //添加至数组  
                startStop.push(currentYearFirstDate);
                startStop.push(currentYearLastDate);
                //返回  
                return startStop;
            };

            this.getPriorMonthFirstDay = function (year, month) {
                //年份为0代表,是本年的第一月,所以不能减  
                if (month == 0) {
                    month = 11;//月份为上年的最后月份  
                    year--;//年份减1  
                    return new Date(year, month, 1);
                }
                //否则,只减去月份  
                month--;
                return new Date(year, month, 1);;
            };

            this.getPreviousMonth = function () {
                //起止日期数组  
                var startStop = new Array();
                //获取当前时间  
                var currentDate = this.getCurrentDate();
                //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 priorMonthFirstDay = this.getPriorMonthFirstDay(currentYear, currentMonth);
                //获得上一月的最后一天  
                var priorMonthLastDay = new Date(priorMonthFirstDay.getFullYear(), priorMonthFirstDay.getMonth(), this.getMonthDays(priorMonthFirstDay.getFullYear(), priorMonthFirstDay.getMonth()));
                //添加至数组  
                startStop.push(priorMonthFirstDay);
                startStop.push(priorMonthLastDay);
                //返回  
                return startStop;
            };

            this.getPreviousWeek = function () {
                //起止日期数组  
                var startStop = new Array();
                //获取当前时间  
                var currentDate = this.getCurrentDate();
                //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();
                //一天的毫秒数  
                var millisecond = 1000 * 60 * 60 * 24;
                //减去的天数  
                var minusDay = week != 0 ? week - 1 : 6;
                //获得当前周的第一天  
                var currentWeekDayOne = new Date(currentDate.getTime() - (millisecond * minusDay));
                //上周最后一天即本周开始的前一天  
                var priorWeekLastDay = new Date(currentWeekDayOne.getTime() - millisecond);
                //上周的第一天  
                var priorWeekFirstDay = new Date(priorWeekLastDay.getTime() - (millisecond * 6));
                //添加至数组  
                startStop.push(priorWeekFirstDay);
                startStop.push(priorWeekLastDay);
                return startStop;
            };

            this.getPriorSeasonFirstDay = function (year, month) {
                var quarterMonthStart = 0;
                var spring = 0; //春  
                var summer = 3; //夏  
                var fall = 6;   //秋  
                var winter = 9;//冬
                
                //月份从0-11  
                switch (Math.floor(month/3)) {//季度的其实月份  
                    case 0:
                        //如果是第一季度则应该到去年的冬季  
                        year--;
                        month = winter;
                        break;
                    case 1:
                        month = spring;
                        break;
                    case 2:
                        month = summer;
                        break;
                    case 3:
                        month = fall;
                        break;
                };
                return new Date(year, month, 1);
            };

            this.getPreviousSeason = function () {
                //起止日期数组  
                var startStop = new Array();
                //获取当前时间  
                var currentDate = this.getCurrentDate();
                //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();
                //上季度的第一天  
                var priorSeasonFirstDay = this.getPriorSeasonFirstDay(currentYear, currentMonth);
                //上季度的最后一天  
                var priorSeasonLastDay = new Date(priorSeasonFirstDay.getFullYear(), priorSeasonFirstDay.getMonth() + 2, this.getMonthDays(priorSeasonFirstDay.getFullYear(), priorSeasonFirstDay.getMonth() + 2));
                //添加至数组  
                startStop.push(priorSeasonFirstDay);
                startStop.push(priorSeasonLastDay);
                return startStop;
            };

            this.getPreviousYear = function () {
                //起止日期数组  
                var startStop = new Array();
                //获取当前时间  
                var currentDate = this.getCurrentDate();
                //获得当前年份4位年  
                var currentYear = currentDate.getFullYear();
                currentYear--;
                var priorYearFirstDay = new Date(currentYear, 0, 1);
                var priorYearLastDay = new Date(currentYear, 11, 31);
                //添加至数组  
                startStop.push(priorYearFirstDay);
                startStop.push(priorYearLastDay);
                return startStop;
            };
        };

 <select id="sel">
        <option value="cw">本周</option>
        <option value="pw">上周</option>
        <option value="cm">本月</option>
        <option value="pm">上月</option>
        <option value="cq">本季</option>
        <option value="pq">上季</option>
        <option value="cy">本年</option>
        <option value="py">上年</option>
    </select><br /><br/>
    <input type="text" name="name" value=" " id="sDate" />至
    <input type="text" name="name" value=" " id="eDate" />