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JS-时间函数
/** * 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; * */
<script type="text/javascript"> function showdate(n) { var uom = new Date(new Date()-0+n*86400000); uom = uom.getFullYear() + "-" + (uom.getMonth()+1) + "-" + uom.getDate(); return uom; } window.alert("今天是:"+showdate(0)); window.alert("昨天是:"+showdate(-1)); window.alert("明天是:"+showdate(1)); window.alert("10天前是:"+showdate(-10)); window.alert("5天后是:"+showdate(5)); </script>
原文:http://www.cnblogs.com/emanlee/archive/2009/04/05/1429666.html
JS-时间函数
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