jQuery.dateCollections = (function(){

    var nowDate = new Date();
    var cloneNowDate = new Date();

    var fullYear = nowDate.getFullYear();
    var month = nowDate.getMonth() + 1; // getMonth 方法返回 0-11，代表1-12月
    var date = nowDate.getDate();

    var endOfMonth = new Date(fullYear, month, 0).getDate(); //
 
 獲取本月最後一天

    // 格式化日期 (2016-02-14)
    function getFullDate(targetDate) {
        var D, y, m, d;
        if (targetDate) {
            D = new Date(targetDate);
            y = D.getFullYear();
            m = D.getMonth() + 1;
            d = D.getDate();
        } else {
            y = fullYear;
            m 
 
= month;
            d = date;
        }
        m = m > 9 ? m : '0' + m;
        d = d > 9 ? d : '0' + d;

        return y + '-' + m + '-' + d;
    }

    // 一天的時間戳(毫秒為單位)
    var timestampOfDay = 1000*60*60*24;

    // 今天，昨天
    var fullToday = getFullDate();
    var fullYesterday = getFullDate(nowDate - timestampOfDay);

    
 
var nowDay = nowDate.getDay(); // getDay 方法返回0 表示星期天
    nowDay = nowDay === 0 ? 7 : nowDay;

    // 本週一，本週末(星期天)
    // 注：在safari下（nowDate +- 0）不會轉換為時間戳，這裡在nowDate前加上運算子+，手動轉換時間戳運算
    var fullMonday = getFullDate( +nowDate - (nowDay-1)*timestampOfDay );
    var fullSunday = getFullDate( +nowDate + (7-nowDay)*timestampOfDay );

    // 月初，月末
    var fullStartOfMonth = getFullDate( cloneNowDate.setDate(1) );
    var fullEndOfMonth = getFullDate( cloneNowDate.setDate(endOfMonth) );

    return {
        fullToday: fullToday,
        fullYesterday: fullYesterday,
        fullMonday: fullMonday,
        fullSunday: fullSunday,
        fullStartOfMonth: fullStartOfMonth,
        fullEndOfMonth: fullEndOfMonth
    };

}());