dateUtils.js

(function () {
    /**
   * 去掉日期的时间信息
   * @return {Date} 去掉时间信息的日期
   */
    Date.prototype.clearTime = function () {
        this.setHours(0);
        this.setMinutes(0);
        this.setSeconds(0);
        this.setMilliseconds(0);
        return this;
    };
    /**
   * 日期天数加减
   * @param {int} value 需要加减的天数
   */
    Date.prototype.addDays = function (value) {
        this.setDate(this.getDate() + value * 1);
        return this;
    };
    Date.prototype.addMonths = function (value) {
        this.setMonth(this.getMonth() + value * 1);
        return this;
    };
    Date.prototype.firstDayOfMonth = function () {
        this.setDate(1);
        return this;
    };
    Date.today = function () {
        return new Date().clearTime();
    };
    Date.prototype.diff = function (otherDate) {
        let time = otherDate.getTime() - this.getTime();
        return Math.floor(time / (24 * 60 * 60 * 1000));
    };
    Date.prototype.clone = function () {
        let time = this.getTime();
        return new Date(time);
    };
    /**
    * 格式化时间
    * @param format 格式化 "yyyy-MM-dd hh:mm:ss www"
    * @returns {string} 格式化后字符串
    */
    Date.prototype.format = function (format) {
        let o = {
            'M+': this.getMonth() + 1,
            'd+': this.getDate(),
            'h+': this.getHours(),
            'm+': this.getMinutes(),
            's+': this.getSeconds(),
            'q+': Math.floor((this.getMonth() + 3) / 3),
            'S': this.getMilliseconds()
        };
        var w = [
            ['日', '一', '二', '三', '四', '五', '六'],
            ['周日', '周一', '周二', '周三', '周四', '周五', '周六'],
            ['星期日', '星期一', '星期二', '星期三', '星期四', '星期五', '星期六']
        ];
        if (/(y+)/.test(format)) {
            format = format.replace(RegExp.$1, (this.getFullYear() + '').substr(4 - RegExp.$1.length));
        }
        if (/(w+)/.test(format)) {
            format = format.replace(RegExp.$1, w[RegExp.$1.length - 1][this.getDay()]);
        }
        for (var k in o) {
            if (new RegExp('(' + k + ')').test(format)) {
                format = format.replace(RegExp.$1, RegExp.$1.length == 1 ? o[k] : ('00' + o[k]).substr(('' + o[k]).length));
            }
        }
        return format;
    };
    /**
    * 计算间隔时间
    * @param {[type]} cDate [description]
    * @param {[type]} mode  [description]
    */
    Date.prototype.dayDiff = function (data) {
        try {
            data.getYear();
        }
        catch (e) {
            return (0);
        }
        var base = 24 * 60 * 60 * 1000;
        var result = Math.abs(this - data) / base;
        return (parseInt(result, 10));
    };
    /**
     * 比较时间
     * @param  {[type]} date1 [description]
     * @param  {[type]} date2 [description]
     * @return {[type]}       [description]
     */
    Date.prototype.compareDate = function (date1, date2) {
        date1 = new Date(date1.replace(/\-/g, '\/'));
        date2 = new Date(date2.replace(/\-/g, '\/'));
        return date1 - date2;
    };

    Date.prototype.DateDiff = function(interval,date1,date2){  
      function TimeCom(dateValue){  
        var newCom = new Date(dateValue);  
        this.year = newCom.getFullYear();  
        this.month = newCom.getMonth()+1;  
        this.day = newCom.getDate();  
        this.hour = newCom.getHours();  
        this.minute = newCom.getMinutes();  
        this.second = newCom.getSeconds();  
        this.msecond = newCom.getMilliseconds();  
        this.week = newCom.getDay();  
      }

      var TimeCom1 = new TimeCom(date1);  
      var TimeCom2 = new TimeCom(date2);  
      var result;  
      switch(String(interval).toLowerCase())  
      {  
        case "y":  
        case "year":  
        result = TimeCom1.year-TimeCom2.year;  
        break;  
        case "n":  
        case "month":  
        result = (TimeCom1.year-TimeCom2.year)*12+(TimeCom1.month-TimeCom2.month);  
        break;  
        case "d":  
        case "day":  
        result = Math.round((Date.UTC(TimeCom1.year,TimeCom1.month-1,TimeCom1.day)-Date.UTC(TimeCom2.year,TimeCom2.month-1,TimeCom2.day))/(1000*60*60*24));  
        break;  
        case "h":  
        case "hour":  
        result = Math.round((Date.UTC(TimeCom1.year,TimeCom1.month-1,TimeCom1.day,TimeCom1.hour)-Date.UTC(TimeCom2.year,TimeCom2.month-1,TimeCom2.day,TimeCom2.hour))/(1000*60*60));  
        break;  
        case "m":  
        case "minute":  
        result = Math.round((Date.UTC(TimeCom1.year,TimeCom1.month-1,TimeCom1.day,TimeCom1.hour,TimeCom1.minute)-Date.UTC(TimeCom2.year,TimeCom2.month-1,TimeCom2.day,TimeCom2.hour,TimeCom2.minute))/(1000*60));  
        break;  
        case "s":  
        case "second":  
        result = Math.round((Date.UTC(TimeCom1.year,TimeCom1.month-1,TimeCom1.day,TimeCom1.hour,TimeCom1.minute,TimeCom1.second)-Date.UTC(TimeCom2.year,TimeCom2.month-1,TimeCom2.day,TimeCom2.hour,TimeCom2.minute,TimeCom2.second))/1000);  
        break;  
        case "ms":  
        case "msecond":  
        result = Date.UTC(TimeCom1.year,TimeCom1.month-1,TimeCom1.day,TimeCom1.hour,TimeCom1.minute,TimeCom1.second,TimeCom1.msecond)-Date.UTC(TimeCom2.year,TimeCom2.month-1,TimeCom2.day,TimeCom2.hour,TimeCom2.minute,TimeCom2.second,TimeCom1.msecond);  
        break; 
        default:  
        result = "invalid";  
      }  
      return(result);  
   }
})();