One wave of JavaScript date judgment script sharing and one wave of javascript

One wave of JavaScript date judgment script sharing and one wave of javascript

1. Compare two dates

var x = new Date('2015-05-25'); var y = new Date('2015-05-25');  if (x.getTime() == y.getTime()) {  It'll be true; } 

2. Whether it is between two dates

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. One line of code to determine whether it is a leap year

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. Judge the status of one week before and after major holidays (National Day and Spring Festival)

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. Determine the day of the week

<SCRIPT> var s = '1970-11-17 '; alert ("Today's Week" + "day 2011 five or six ". charAt (new Date (s ). getDay (); alert ("Week" + new Date (s ). getDay (); </SCRIPT>

You can also do this:

Var weekDay = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]; var dateStr = "2008-08-08 "; var myDate = new Date (Date. parse (dateStr. replace (/-/g, "/"); alert (weekDay [myDate. getDay ()]);

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