JS获取时间戳

悠悠 2021-09-07 06:12 597阅读 0赞

此文章来自转载 ：  
链接: [JS获取本周、本季度、本月、上月、本年的开始日期、结束日期][JS].

/** * 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 days= getMonthDays(nowMonth);//获取当月总共有多少天
     var monthEndDate = new Date(nowYear, nowMonth, days); 
     return formatDate(monthEndDate); //返回当月结束时间
    }
     
    注意：因为上面这个方法里的getMonthDays(nowMonth)方法 我尝试使用失败，我不知道是什么原因 所以我用了另外个方法如下（获得某月的天数,需要配合文章开头的公式 ）：
     
    //获得某月的天数 （与上面有重复可删除，不然本月结束日期报错）
        function getMonthDays(nowyear,myMonth){ 
         var lastMonthStartDate = new Date(nowyear, lastMonth, 1);
         var lastMonthEndDate= new Date(nowyear, lastMonth+ 1, 1);
         var days = (lastMonthEndDate- lastMonthStartDate) / (1000 * 60 * 60 * 24);//格式转换
        alert(days);
       }
     
    //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); 
    }
     
    //获取本年开始-当前时间
     
    var currentYear=now.getFullYear();//获得当前年份4位年
     
    var currentYearFirstDate=new Date(currentYear,0,1); //本年第一天
     
    var startTime = currentYearFirstDate.getFullYear() + '-' + (currentYearFirstDate.getMonth() +1) + '-' + currentYearFirstDate.getDate()+''+currentYearFirstDate.getHours()+':'+currentYearFirstDate.getMinutes()+':'+
     
    currentYearFirstDate.getSeconds(); //格式化本年第一天日期
     
    var currentYearEndDate=now; //当前时间

[JS]: https://www.bbsmax.com/A/E35pRVRbzv/