js获得本周，本月，本季度的开始日期和结束日期
<script> var now = new Date(); //当前日期 var nowDayOfWeek = now.getDay(); //今天本周的第几天 var nowDay = now.getDate(); //当前日 var nowMonth = now.getMonth(); //当前月 var nowYear = now.getYear(); //当前年 nowYear += (nowYear < 2000) ? 1900 : 0; // //格式化日期：yyyy-MM-dd function formatDate(date) { var myyear = date.getFullYear(); var mymonth = date.getMonth()+1; var myweekday = date.getDate(); if(mymonth < 10){ mymonth = "0" + mymonth; } if(myweekday < 10){ myweekday = "0" + myweekday; } // return (myyear+"-"+mymonth + "-" + myweekday); //格式化日期：yyyy-MM-dd HH:MM:SS var myHour = date.getHours(); var myMinute = date.getMinutes(); var mySecond = date.getSeconds(); if(myHour < 10){ myHour = "0" + myHour; } if(myMinute < 10){ myMinute = "0" + myMinute; } if(mySecond < 10){ mySecond = "0" + mySecond; } return (myyear+"-"+mymonth + "-" + myweekday+" "+myHour+":"+myMinute+":"+mySecond); } //获得某月的天数 function getMonthDays(myMonth){ var monthStartDate = new Date(nowYear, myMonth, 1); var monthEndDate = new Date(nowYear, myMonth + 1, 1); var days = (monthEndDate - monthStartDate)/(1000 * 60 * 60 * 24); return days; } //获得本季度的开始月份 function getQuarterStartMonth(){ var quarterStartMonth = 0; if(nowMonth<3){ quarterStartMonth = 0; } if(2<nowMonth && nowMonth<6){ quarterStartMonth = 3; } if(5<nowMonth && nowMonth<9){ quarterStartMonth = 6; } if(nowMonth>8){ quarterStartMonth = 9; } return quarterStartMonth; } //获得本天(i=0)的开始时间 function getDayStartDate(i) { var nowStartDay = new Date(nowYear, nowMonth, nowDay+i); return formatDate(nowStartDay); } //获得本天(i=0)的结束时间 function getDayEndDate(i) { var nowStartDay = new Date(nowYear, nowMonth, nowDay+i,23,59,59); return formatDate(nowStartDay); }?//获得本周(i=0)的开始日期 function getWeekStartDate(i) { //var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek); var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek+7*i); return formatDate(weekStartDate); } //获得本周的结束日期 function getWeekEndDate(i) { // var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek)); var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek)+7*i,23,59,59); return formatDate(weekEndDate); } //获得本月的开始日期 function getMonthStartDate(i){ //var monthStartDate = new Date(nowYear, nowMonth, 1); var monthStartDate = new Date(nowYear, nowMonth+i, 1); return formatDate(monthStartDate); } //获得本月的结束日期 function getMonthEndDate(i){ //var monthEndDate = new Date(nowYear, nowMonth, getMonthDays(nowMonth)); var monthEndDate = new Date(nowYear, nowMonth+i, getMonthDays(nowMonth+i,),23,59,59); return formatDate(monthEndDate); } //获得本季度的开始日期 function getQuarterStartDate(i){ //var quarterStartDate = new Date(nowYear, getQuarterStartMonth(), 1); var quarterStartDate = new Date(nowYear, getQuarterStartMonth()+3*i, 1); return formatDate(quarterStartDate); } //或的本季度的结束日期 function getQuarterEndDate(i){ var quarterEndMonth = getQuarterStartMonth()+3*i + 2; //var quarterStartDate = new Date(nowYear, quarterEndMonth, getMonthDays(quarterEndMonth)); var quarterStartDate = new Date(nowYear, quarterEndMonth, getMonthDays(quarterEndMonth),23,59,59); return formatDate(quarterStartDate); } //获得本年度的开始日期 function getYearStartDate(i){ var quarterStartDate = new Date(nowYear+i, 0, 1); return formatDate(quarterStartDate); } //获得本年度的结束日期 function getYearEndDate(i){ var quarterStartDate = new Date(nowYear+i, 11, getMonthDays(11),23,59,59); return formatDate(quarterStartDate); } alert(getMonthStartDate(1)); </script>