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标题 一波JavaScript日期判断脚本分享
范文
    这篇文章主要介绍了一波JavaScript日期判断脚本分享,包括计算日期是否在时间段内即闰年的判断等,需要的朋友可以参考下
    1、比较两个日期先后
    var x = new Date('2015-05-25'); 
    var y = new Date('2015-05-25'); 
    if (x.getTime() == y.getTime()) { 
     It'll be true; 
    } 
    2、是否在两个日期之间  
    var beforeSpringDate, afterSpringDate; 
     for (var i = 0; i < springFestivalDays.length; i++) { 
     beforeSpringDate = new Date(springFestivalDays[i]); 
     beforeSpringDate.setDate(beforeSpringDate.getDate() - 4); 
     afterSpringDate = new Date(springFestivalDays[i]); 
     afterSpringDate.setDate(afterSpringDate.getDate() + springFestivalPeriod - 1); 
     if (time >= beforeSpringDate.getTime() && time <= afterSpringDate.getTime()) { 
      result = true; 
      break; 
     } 
     }
    3、一行代码判断是否是闰年
    var input = new Date();new Date(input.getFullYear(), 1, 29).getDate() === 29 
    false
    var input = new Date(2012,1,1);new Date(input.getFullYear(), 1, 29).getDate() === 29 
    true
    var input = new Date(2013,1,1);new Date(input.getFullYear(), 1, 29).getDate() === 29 
    false
    var input = new Date(2014,1,1);new Date(input.getFullYear(), 1, 29).getDate() === 29 
    false
    var input = new Date(2014,5,1);new Date(input.getFullYear(), 1, 29).getDate() === 29 
    false
    var input = new Date(2014,6,1);new Date(input.getFullYear(), 1, 29).getDate() === 29 
    false
    var input = new Date(2016,6,1);new Date(input.getFullYear(), 1, 29).getDate() === 29 
    true
    var input = new Date(2000,6,1);new Date(input.getFullYear(), 1, 29).getDate() === 29 
    true
    4、判断重大节日(国庆、春节)前后一周状态
    var holiday = {}; 
    function inNationalDay(date) { 
     var result = { 
     beforeNationalDay: false, 
     duringNationalDay: false
     }; 
     if (date) { 
     var month = date.getMonth() + 1, 
      day = date.getDate(); 
     if (month == 9 && (day >= 24 && day <= 30)) { 
      result.beforeNationalDay = true; 
     } else if(month == 10 && (day >= 1 && day <= 7)) { 
      result.duringNationalDay = true; 
     } 
     } 
     return result; 
    } 
    function inSpringFestival(date) { 
     var result = { 
     beforeSpringFestival: false, 
     duringSpringFestival: false
     }; 
     if (date) { 
     // set GMT+0800 hours(set china hour +8) 
     date = new Date(date.getFullYear(), date.getMonth(), date.getDate(), 8); 
     var time = date.getTime(); 
     var springFestivalDays = ['2015-02-19', '2016-02-08', '2017-01-28', '2018-02-16', '2019-02-05', 
      '2020-01-25', '2021-02-12', '2022-02-01', '2023-01-22', '2024-02-10']; 
     var springDay, springDate, beforeSpringDate, afterSpringDate; 
     for (var i = 0; i < springFestivalDays.length; i++) { 
      springDay = springFestivalDays[i]; 
      springDate = new Date(springDay); 
      beforeSpringDate = new Date(springDay); 
      beforeSpringDate.setDate(beforeSpringDate.getDate() - 7); 
      afterSpringDate = new Date(springDay); 
      afterSpringDate.setDate(afterSpringDate.getDate() + 7); 
      if (time >= beforeSpringDate.getTime() && time < springDate.getTime()) { 
      result.beforeSpringFestival = true; 
      break; 
      } else if (time >= springDate.getTime() && time < afterSpringDate.getTime()) { 
      result.duringSpringFestival = true; 
      break; 
      } 
     } 
     } 
     return result; 
    } 
    holiday.cache = { 
     lastUpdateDate: null, 
     beforeHoliday: false, 
     duringHoliday: false
    }; 
    holiday.checkHoliday = function() { 
     var now = new Date(); 
     if (!holiday.cache.lastUpdateDate) { 
     holiday.cache.lastUpdateDate = now; 
     var nationalDayResult = inNationalDay(now); 
     var springFestivalResult = inSpringFestival(now); 
     holiday.cache.beforeHoliday = nationalDayResult.beforeNationalDay || springFestivalResult.beforeSpringFestival; 
     holiday.cache.duringHoliday = nationalDayResult.duringNationalDay || springFestivalResult.duringSpringFestival; 
     } else { 
     var lastUpdateDate = holiday.cache.lastUpdateDate; 
     var cacheDate = lastUpdateDate.getFullYear() + '' + lastUpdateDate.getMonth() + '' + lastUpdateDate.getDate(); 
     var nowDate = now.getFullYear() + '' + now.getMonth() + '' + now.getDate(); 
     if (cacheDate != nowDate) { 
      holiday.cache.lastUpdateDate = now; 
      var nationalDayResult = inNationalDay(now); 
      var springFestivalResult = inSpringFestival(now); 
      holiday.cache.beforeHoliday = nationalDayResult.beforeNationalDay || springFestivalResult.beforeSpringFestival; 
      holiday.cache.duringHoliday = nationalDayResult.duringNationalDay || springFestivalResult.duringSpringFestival; 
     } 
     } 
    }; 
    module.exports = holiday; 
    5、判断星期几
    <SCRIPT> 
    var s = '2011-11-17'; 
    alert( "今天星期 "+"天一二三四五六 ".charAt(new Date(s).getDay())); 
    alert("星期 " + new Date(s).getDay()); 
    </SCRIPT> 
    也可以这样：
    var weekDay = ["星期天", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"]; 
      var dateStr = "2008-08-08"; 
      var myDate = new Date(Date.parse(dateStr.replace(/-/g, "/"))); 
      alert(weekDay[myDate.getDay()]); 
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更新时间：2025/5/20 11:26:18