javascript获取当天本周本月本年 开始及结束时间

Posted 2020-10-06 纵横四海 I T 博客园

1. 1. 
      /**
      * 获取本周、本季度、本月、上月的开始日期、结束日期
      */
      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; //
      
      
      var lastMonthDate = new Date(); //上月日期
      lastMonthDate.setDate(1);
      lastMonthDate.setMonth(lastMonthDate.getMonth()-1);
      var lastYear = lastMonthDate.getYear();
      var lastMonth = lastMonthDate.getMonth();
      
      //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);
      }
      
      //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;
      }
      
      //获得本周的开始日期
      function getWeekStartDate() {
      var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek);
      return formatDate(weekStartDate);
      }
      
      //获得本周的结束日期
      function getWeekEndDate() {
      var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek));
      return formatDate(weekEndDate);
      }
      
      //获得本月的开始日期
      function getMonthStartDate(){
      var monthStartDate = new Date(nowYear, nowMonth, 1);
      return formatDate(monthStartDate);
      }
      
      //获得本月的结束日期
      function getMonthEndDate(){
      var monthEndDate = new Date(nowYear, nowMonth, getMonthDays(nowMonth));
      return formatDate(monthEndDate);
      }
      
      
      //获得上月开始时间
      function getLastMonthStartDate(){
      var lastMonthStartDate = new Date(nowYear, lastMonth, 1);
      return formatDate(lastMonthStartDate);
      }
      
      
      //获得上月结束时间
      function getLastMonthEndDate(){
      var lastMonthEndDate = new Date(nowYear, lastMonth, getMonthDays(lastMonth));
      return formatDate(lastMonthEndDate);
      }
      
      //获得本季度的开始日期
      function getQuarterStartDate(){
      
      var quarterStartDate = new Date(nowYear, getQuarterStartMonth(), 1);
      return formatDate(quarterStartDate);
      }
      
      //或的本季度的结束日期
      function getQuarterEndDate(){
      var quarterEndMonth = getQuarterStartMonth() + 2;
      var quarterStartDate = new Date(nowYear, quarterEndMonth, getMonthDays(quarterEndMonth));
      return formatDate(quarterStartDate);
      }