js日期相关

/**

• 日期范围工具类
  /
  var dateRangeUtil = (function () {
  /**

  • 获得当前时间
    */
    this.getCurrentDate = function () {
    return new Date();
    };

  /***

  • 获得本周起止时间
    */
    this.

  /***

  • 获得本月的起止时间
    */
    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;
    };

  /**

  • 得到本季度开始的月份

  • @param month 需要计算的月份
    ***/
    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;
    };

  /**

  • 获得该月的天数

  • @param year年份

  • @param month月份

  • */
    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();
    };

  /**

  • 获得本季度的起止日期
    */
    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;
    };

  /***

  • 得到本年的起止日期

  */
  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;
  

  };

  /**

  • 返回上一个月的第一天Date类型
  • @param year 年
  • @param month 月
    **/
    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);;
    };

  /**

  • 获得上一月的起止日期
  • ***/
    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;
    };

  /**

  • 获得上一周的起止日期

  • **/
    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;
    };

  /**

  • 得到上季度的起始日期

  • year 这个年应该是运算后得到的当前本季度的年份

  • month 这个应该是运算后得到的当前季度的开始月份

  • */
    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 (month) {//季度的其实月份
    case spring:
    //如果是第一季度则应该到去年的冬季
    year--;
    month = winter;
    break;
    case summer:
    month = spring;
    break;
    case fall:
    month = summer;
    break;
    case winter:
    month = fall;
    break;

    };

    return new Date(year, month, 1);
    };

  /**

  • 得到上季度的起止日期
  • **/
    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;
    };

  /**

  • 得到去年的起止日期
  • **/
    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, 1);
    //添加至数组
    startStop.push(priorYearFirstDay);
    startStop.push(priorYearLastDay);
    return startStop;
    };

  return this;
  })();

/*

• 使用:
  case "本月":
  $("#startDate").val(dateRangeUtil.getCurrentMonth()[0].Format("yyyy-MM-dd"));
  $("#endDate").val(dateRangeUtil.getCurrentMonth()[1].Format("yyyy-MM-dd"));
  break;

*/