Js获取 本周、本月、本季度、本年、上月、上周、上季度、去年时间段

/** * 针对时间的工具类 */

var DateTimeUtil = 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;

	};

};