JavaScript日期集合（今日，昨日，本周一，周末 ，月初，月末）

一、封装为jQuery版日期集合插件

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(); // 获取本月最后一天

    // 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;
    }

    // 一天的时间戳(毫秒为单位)
    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;

    // 本周一，本周末(星期天)
    // 注：在safari下（nowDate +- 0）不会转换为时间戳，这里在nowDate前加上运算符+，手动转换时间戳运算
    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
    };

}());

二、封装为模块，可用于webpack工具打包

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(); // 获取本月最后一天

// 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;
}

// 一天的时间戳(毫秒为单位)
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;

// 本周一，本周末(星期天)
// 注：在safari下（nowDate +- 0）不会转换为时间戳，这里在nowDate前加上运算符+，手动转换时间戳运算
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) );

module.exports = {
    fullToday: fullToday,
    fullYesterday: fullYesterday,
    fullMonday: fullMonday,
    fullSunday: fullSunday,
    fullStartOfMonth: fullStartOfMonth,
    fullEndOfMonth: fullEndOfMonth
};