JS 获取 本周、本月、本季度、本年、上月、上周、上季度、去年

/**
* 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.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;
};

/***
* 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;
})();

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