如何获取JavaScript中两个日期之间的天数?例如,在输入框中给出两个日期:
<input id="first" value="1/1/2000"/>
<input id="second" value="1/1/2001"/>
<script>
alert(datediff("day", first, second)); // what goes here?
</script>
答案 0 :(得分:370)
这是datediff
的快速和肮脏实现,作为解决问题中提出的问题的概念证明。它依赖于这样一个事实:你可以通过减去它们来获得两个日期之间经过的毫秒数,这会将它们强制转换为它们的原始数值(自1970年开始以来的毫秒数)。
// new Date("dateString") is browser-dependent and discouraged, so we'll write
// a simple parse function for U.S. date format (which does no error checking)
function parseDate(str) {
var mdy = str.split('/');
return new Date(mdy[2], mdy[0]-1, mdy[1]);
}
function datediff(first, second) {
// Take the difference between the dates and divide by milliseconds per day.
// Round to nearest whole number to deal with DST.
return Math.round((second-first)/(1000*60*60*24));
}
alert(datediff(parseDate(first.value), parseDate(second.value)));
<input id="first" value="1/1/2000"/>
<input id="second" value="1/1/2001"/>
您应该知道“普通”日期API(名称中没有“UTC”)在用户浏览器的本地时区运行,因此一般情况下,如果您的用户位于您所在的时区,则可能会遇到问题不要指望,你的代码将不得不处理夏令时转换。您应该仔细阅读Date对象及其方法的文档,对于任何更复杂的文档,强烈考虑使用提供更安全和强大的API来进行日期操作的库。
另外,为了便于说明,该代码段使用named access on the window
object以简化,但在生产中,您应该使用标准化的API,如getElementById,或者更可能使用某些UI框架。
答案 1 :(得分:191)
在撰写本文时,只有其中一个答案正确处理DST(夏令时)转换。以下是位于加利福尼亚州的系统的结果:
1/1/2013- 3/10/2013- 11/3/2013-
User Formula 2/1/2013 3/11/2013 11/4/2013 Result
--------- --------------------------- -------- --------- --------- ---------
Miles (d2 - d1) / N 31 0.9583333 1.0416666 Incorrect
some Math.floor((d2 - d1) / N) 31 0 1 Incorrect
fuentesjr Math.round((d2 - d1) / N) 31 1 1 Correct
toloco Math.ceiling((d2 - d1) / N) 31 1 2 Incorrect
N = 86400000
虽然Math.round
会返回正确的结果,但我认为它有点笨拙。相反,通过在DST开始或结束时明确说明UTC偏移的变化,我们可以使用精确算术:
function treatAsUTC(date) {
var result = new Date(date);
result.setMinutes(result.getMinutes() - result.getTimezoneOffset());
return result;
}
function daysBetween(startDate, endDate) {
var millisecondsPerDay = 24 * 60 * 60 * 1000;
return (treatAsUTC(endDate) - treatAsUTC(startDate)) / millisecondsPerDay;
}
alert(daysBetween($('#first').val(), $('#second').val()));
JavaScript日期计算很棘手,因为Date
个对象在UTC内部存储时间,而不是本地时间。例如,3/10/2013 12:00 AM太平洋标准时间(UTC-08:00)存储为3/10/2013 8:00 AM UTC和3/11/2013 12:00 AM Pacific Daylight Time( UTC-07:00)存储为3/11/2013 7:00 AM UTC。在这一天午夜到午夜当地时间只有23小时的UTC!
虽然当地时间的一天可能有多于或少于24小时,但UTC中的一天总是正好24小时。 1 上面显示的daysBetween
方法利用了这一事实首先调用treatAsUTC
将本地时间调整为午夜UTC,然后再减去并进行划分。
1。 JavaScript忽略了闰秒。
答案 2 :(得分:107)
获得两个日期之间差异的最简单方法:
var diff = Math.floor(( Date.parse(str2) - Date.parse(str1) ) / 86400000);
您可以获得差异天数(如果无法解析其中一个或两个,则为NaN)。解析日期以毫秒为单位给出结果,并且按天划分它需要将其除以24 * 60 * 60 * 1000
如果你想要它除以天,小时,分钟,秒和毫秒:
function dateDiff( str1, str2 ) {
var diff = Date.parse( str2 ) - Date.parse( str1 );
return isNaN( diff ) ? NaN : {
diff : diff,
ms : Math.floor( diff % 1000 ),
s : Math.floor( diff / 1000 % 60 ),
m : Math.floor( diff / 60000 % 60 ),
h : Math.floor( diff / 3600000 % 24 ),
d : Math.floor( diff / 86400000 )
};
}
以下是James版本的重构版本:
function mydiff(date1,date2,interval) {
var second=1000, minute=second*60, hour=minute*60, day=hour*24, week=day*7;
date1 = new Date(date1);
date2 = new Date(date2);
var timediff = date2 - date1;
if (isNaN(timediff)) return NaN;
switch (interval) {
case "years": return date2.getFullYear() - date1.getFullYear();
case "months": return (
( date2.getFullYear() * 12 + date2.getMonth() )
-
( date1.getFullYear() * 12 + date1.getMonth() )
);
case "weeks" : return Math.floor(timediff / week);
case "days" : return Math.floor(timediff / day);
case "hours" : return Math.floor(timediff / hour);
case "minutes": return Math.floor(timediff / minute);
case "seconds": return Math.floor(timediff / second);
default: return undefined;
}
}
答案 3 :(得分:81)
我建议使用moment.js库(http://momentjs.com/docs/#/displaying/difference/)。它正确处理夏令时,一般来说都很适合。
示例:
var start = moment("2013-11-03");
var end = moment("2013-11-04");
end.diff(start, "days")
1
答案 4 :(得分:40)
我会继续grab this small utility并在其中找到适合您的功能。这是一个简短的例子:
<script type="text/javascript" src="date.js"></script>
<script type="text/javascript">
var minutes = 1000*60;
var hours = minutes*60;
var days = hours*24;
var foo_date1 = getDateFromFormat("02/10/2009", "M/d/y");
var foo_date2 = getDateFromFormat("02/12/2009", "M/d/y");
var diff_date = Math.round((foo_date2 - foo_date1)/days);
alert("Diff date is: " + diff_date );
</script>
答案 5 :(得分:12)
使用Moment.js
var future = moment('05/02/2015');
var start = moment('04/23/2015');
var d = future.diff(start, 'days'); // 9
console.log(d);
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.17.1/moment-with-locales.min.js"></script>
答案 6 :(得分:12)
const startDate = '2017-11-08';
const endDate = '2017-10-01';
const timeDiff = (new Date(startDate)) - (new Date(endDate));
const days = timeDiff / (1000 * 60 * 60 * 24)
答案 7 :(得分:10)
JS中的日期值是日期时间值。
因此,直接日期计算不一致:
(2013-11-05 00:00:00) - (2013-11-04 10:10:10) < 1 day
例如我们需要转换第二个日期:
(2013-11-05 00:00:00) - (2013-11-04 00:00:00) = 1 day
该方法可能会截断两个日期的工厂:
var date1 = new Date('2013/11/04 00:00:00');
var date2 = new Date('2013/11/04 10:10:10'); //less than 1
var start = Math.floor(date1.getTime() / (3600 * 24 * 1000)); //days as integer from..
var end = Math.floor(date2.getTime() / (3600 * 24 * 1000)); //days as integer from..
var daysDiff = end - start; // exact dates
console.log(daysDiff);
date2 = new Date('2013/11/05 00:00:00'); //1
var start = Math.floor(date1.getTime() / (3600 * 24 * 1000)); //days as integer from..
var end = Math.floor(date2.getTime() / (3600 * 24 * 1000)); //days as integer from..
var daysDiff = end - start; // exact dates
console.log(daysDiff);
答案 8 :(得分:9)
最好使用UTC时间摆脱DST,Math.ceil,Math.floor等:
var firstDate = Date.UTC(2015,01,2);
var secondDate = Date.UTC(2015,04,22);
var diff = Math.abs((firstDate.valueOf()
- secondDate.valueOf())/(24*60*60*1000));
此示例给出差异109天。 24*60*60*1000
是一天(毫秒)。
答案 9 :(得分:9)
要计算两个给定日期之间的天数,您可以使用以下代码。我在这里使用的日期是2016年1月1日和2016年12月31日
var day_start = new Date("Jan 01 2016");
var day_end = new Date("Dec 31 2016");
var total_days = (day_end - day_start) / (1000 * 60 * 60 * 24);
document.getElementById("demo").innerHTML = Math.round(total_days);
&#13;
<h3>DAYS BETWEEN GIVEN DATES</h3>
<p id="demo"></p>
&#13;
答案 10 :(得分:7)
可以使用以下公式计算在不同TZ之间休息的两个日期之间的完整证明天差:
var start = new Date('10/3/2015');
var end = new Date('11/2/2015');
var days = (end - start) / 1000 / 60 / 60 / 24;
console.log(days);
// actually its 30 ; but due to daylight savings will show 31.0xxx
// which you need to offset as below
days = days - (end.getTimezoneOffset() - start.getTimezoneOffset()) / (60 * 24);
console.log(days);
&#13;
答案 11 :(得分:6)
当我想在两个日期做一些计算时,我发现了这个问题,但日期有小时和分钟值,我修改了@ michael-liu的答案以符合我的要求,并通过了我的测试。
差异天2012-12-31 23:00
和2013-01-01 01:00
应该等于1.(2小时)
差异天2012-12-31 01:00
和2013-01-01 23:00
应该等于1.(46小时)
function treatAsUTC(date) {
var result = new Date(date);
result.setMinutes(result.getMinutes() - result.getTimezoneOffset());
return result;
}
var millisecondsPerDay = 24 * 60 * 60 * 1000;
function diffDays(startDate, endDate) {
return Math.floor(treatAsUTC(endDate) / millisecondsPerDay) - Math.floor(treatAsUTC(startDate) / millisecondsPerDay);
}
答案 12 :(得分:6)
我认为解决方案不是正确的100%我会使用 ceil 而不是 floor ,round会工作,但它不是正确的操作
function dateDiff(str1, str2){
var diff = Date.parse(str2) - Date.parse(str1);
return isNaN(diff) ? NaN : {
diff: diff,
ms: Math.ceil(diff % 1000),
s: Math.ceil(diff / 1000 % 60),
m: Math.ceil(diff / 60000 % 60),
h: Math.ceil(diff / 3600000 % 24),
d: Math.ceil(diff / 86400000)
};
}
答案 13 :(得分:5)
function timeDifference(date1, date2) {
var oneDay = 24 * 60 * 60; // hours*minutes*seconds
var oneHour = 60 * 60; // minutes*seconds
var oneMinute = 60; // 60 seconds
var firstDate = date1.getTime(); // convert to milliseconds
var secondDate = date2.getTime(); // convert to milliseconds
var seconds = Math.round(Math.abs(firstDate - secondDate) / 1000); //calculate the diffrence in seconds
// the difference object
var difference = {
"days": 0,
"hours": 0,
"minutes": 0,
"seconds": 0,
}
//calculate all the days and substract it from the total
while (seconds >= oneDay) {
difference.days++;
seconds -= oneDay;
}
//calculate all the remaining hours then substract it from the total
while (seconds >= oneHour) {
difference.hours++;
seconds -= oneHour;
}
//calculate all the remaining minutes then substract it from the total
while (seconds >= oneMinute) {
difference.minutes++;
seconds -= oneMinute;
}
//the remaining seconds :
difference.seconds = seconds;
//return the difference object
return difference;
}
console.log(timeDifference(new Date(2017,0,1,0,0,0),new Date()));
答案 14 :(得分:5)
var start= $("#firstDate").datepicker("getDate");
var end= $("#SecondDate").datepicker("getDate");
var days = (end- start) / (1000 * 60 * 60 * 24);
alert(Math.round(days));
jsfiddle示例:)
答案 15 :(得分:5)
使用DatePicker小部件中的formatDate怎么样?您可以使用它来转换时间戳格式的日期(自1970年1月1日起的毫秒数),然后进行简单的减法。
答案 16 :(得分:4)
使用毫秒时要小心。
date.getTime()返回毫秒,执行数学运算时需要包含
的毫秒数上面评论的例子是我到目前为止找到的最佳解决方案 https://stackoverflow.com/a/11252167/2091095。但是,如果您希望计算所有相关日期,请使用 +1 。
function treatAsUTC(date) {
var result = new Date(date);
result.setMinutes(result.getMinutes() - result.getTimezoneOffset());
return result;
}
function daysBetween(startDate, endDate) {
var millisecondsPerDay = 24 * 60 * 60 * 1000;
return (treatAsUTC(endDate) - treatAsUTC(startDate)) / millisecondsPerDay;
}
var diff = daysBetween($('#first').val(), $('#second').val()) + 1;
答案 17 :(得分:4)
这可能不是最优雅的解决方案,但我认为它似乎用相对简单的代码来回答这个问题。你不能使用这样的东西:
function dayDiff(startdate, enddate) {
var dayCount = 0;
while(enddate >= startdate) {
dayCount++;
startdate.setDate(startdate.getDate() + 1);
}
return dayCount;
}
这假设您将日期对象作为参数传递。
答案 18 :(得分:4)
Date.prototype.days = function(to) {
return Math.abs(Math.floor(to.getTime() / (3600 * 24 * 1000)) - Math.floor(this.getTime() / (3600 * 24 * 1000)))
}
console.log(new Date('2014/05/20').days(new Date('2014/05/23'))); // 3 days
console.log(new Date('2014/05/23').days(new Date('2014/05/20'))); // 3 days
答案 19 :(得分:3)
我使用下面的代码来试验新闻帖子的发布日期功能。我根据发布日期和当前日期计算分钟或小时或日或年。
var startDate= new Date("Mon Jan 01 2007 11:00:00");
var endDate =new Date("Tue Jan 02 2007 12:50:00");
var timeStart = startDate.getTime();
var timeEnd = endDate.getTime();
var yearStart = startDate.getFullYear();
var yearEnd = endDate.getFullYear();
if(yearStart == yearEnd)
{
var hourDiff = timeEnd - timeStart;
var secDiff = hourDiff / 1000;
var minDiff = hourDiff / 60 / 1000;
var hDiff = hourDiff / 3600 / 1000;
var myObj = {};
myObj.hours = Math.floor(hDiff);
myObj.minutes = minDiff
if(myObj.hours >= 24)
{
console.log(Math.floor(myObj.hours/24) + "day(s) ago")
}
else if(myObj.hours>0)
{
console.log(myObj.hours +"hour(s) ago")
}
else
{
console.log(Math.abs(myObj.minutes) +"minute(s) ago")
}
}
else
{
var yearDiff = yearEnd - yearStart;
console.log( yearDiff +" year(s) ago");
}
答案 20 :(得分:3)
如果你想要一个带日期的DateArray,试试这个:
<script>
function getDates(startDate, stopDate) {
var dateArray = new Array();
var currentDate = moment(startDate);
dateArray.push( moment(currentDate).format('L'));
var stopDate = moment(stopDate);
while (dateArray[dateArray.length -1] != stopDate._i) {
dateArray.push( moment(currentDate).format('L'));
currentDate = moment(currentDate).add(1, 'days');
}
return dateArray;
}
</script>
答案 21 :(得分:3)
如果你有两个unix时间戳,你可以使用这个功能(为了清晰起见,使其更加冗长):
// Calculate number of days between two unix timestamps
// ------------------------------------------------------------
var daysBetween = function(timeStampA, timeStampB) {
var oneDay = 24 * 60 * 60 * 1000; // hours * minutes * seconds * milliseconds
var firstDate = new Date(timeStampA * 1000);
var secondDate = new Date(timeStampB * 1000);
var diffDays = Math.round(Math.abs((firstDate.getTime() - secondDate.getTime())/(oneDay)));
return diffDays;
};
示例:
daysBetween(1096580303, 1308713220); // 2455
答案 22 :(得分:3)
我在Angular中遇到了同样的问题。我做副本,因为否则他将覆盖第一个日期。两个日期的时间必须为00:00:00(显然)
/*
* Deze functie gebruiken we om het aantal dagen te bereken van een booking.
* */
$scope.berekenDagen = function ()
{
$scope.booking.aantalDagen=0;
/*De loper is gelijk aan de startdag van je reservatie.
* De copy is nodig anders overschijft angular de booking.van.
* */
var loper = angular.copy($scope.booking.van);
/*Zolang de reservatie beschikbaar is, doorloop de weekdagen van je start tot einddatum.*/
while (loper < $scope.booking.tot) {
/*Tel een dag op bij je loper.*/
loper.setDate(loper.getDate() + 1);
$scope.booking.aantalDagen++;
}
/*Start datum telt natuurlijk ook mee*/
$scope.booking.aantalDagen++;
$scope.infomsg +=" aantal dagen: "+$scope.booking.aantalDagen;
};
答案 23 :(得分:3)
计算两个日期之间的天数的简单方法是删除它们的两个时间分量,即将小时,分钟,秒和毫秒设置为0,然后减去它们的时间并以毫秒的价值延迟一天。
var firstDate= new Date(firstDate.setHours(0,0,0,0));
var secondDate= new Date(secondDate.setHours(0,0,0,0));
var timeDiff = firstDate.getTime() - secondDate.getTime();
var diffDays =timeDiff / (1000 * 3600 * 24);
答案 24 :(得分:2)
function formatDate(seconds, dictionary) {
var foo = new Date;
var unixtime_ms = foo.getTime();
var unixtime = parseInt(unixtime_ms / 1000);
var diff = unixtime - seconds;
var display_date;
if (diff <= 0) {
display_date = dictionary.now;
} else if (diff < 60) {
if (diff == 1) {
display_date = diff + ' ' + dictionary.second;
} else {
display_date = diff + ' ' + dictionary.seconds;
}
} else if (diff < 3540) {
diff = Math.round(diff / 60);
if (diff == 1) {
display_date = diff + ' ' + dictionary.minute;
} else {
display_date = diff + ' ' + dictionary.minutes;
}
} else if (diff < 82800) {
diff = Math.round(diff / 3600);
if (diff == 1) {
display_date = diff + ' ' + dictionary.hour;
} else {
display_date = diff + ' ' + dictionary.hours;
}
} else {
diff = Math.round(diff / 86400);
if (diff == 1) {
display_date = diff + ' ' + dictionary.day;
} else {
display_date = diff + ' ' + dictionary.days;
}
}
return display_date;
}
答案 25 :(得分:1)
试试这个
let today = new Date().toISOString().slice(0, 10)
const startDate = '2021-04-15';
const endDate = today;
const diffInMs = new Date(endDate) - new Date(startDate)
const diffInDays = diffInMs / (1000 * 60 * 60 * 24);
alert( diffInDays );
答案 26 :(得分:1)
我最近遇到了同样的问题,来自Java世界,我立即开始搜索JavaScript的JSR 310实现。 JSR 310是Java的日期和时间API(Java 8附带的标准)。我认为API的设计很好。
幸运的是,有一个指向Javascript的直接端口,称为js-joda。
首先,在<head>
中加入js-joda:
<script
src="https://cdnjs.cloudflare.com/ajax/libs/js-joda/1.11.0/js-joda.min.js"
integrity="sha512-piLlO+P2f15QHjUv0DEXBd4HvkL03Orhi30Ur5n1E4Gk2LE4BxiBAP/AD+dxhxpW66DiMY2wZqQWHAuS53RFDg=="
crossorigin="anonymous"></script>
然后只需执行以下操作:
let date1 = JSJoda.LocalDate.of(2020, 12, 1);
let date2 = JSJoda.LocalDate.of(2021, 1, 1);
let daysBetween = JSJoda.ChronoUnit.DAYS.between(date1, date2);
现在daysBetween
包含之间的天数。请注意,结束日期为专有。
答案 27 :(得分:1)
const diff=(e,t)=>Math.floor((new Date(e).getTime()-new Date(t).getTime())/1000*60*60*24);
// or
const diff=(e,t)=>Math.floor((new Date(e).getTime()-new Date(t).getTime())/86400000);
// or
const diff=(e,t)=>Math.floor((new Date(e).getTime()-new Date(t).getTime())/864e5);
// or
const diff=(e,t)=>Math.floor((new Date(e)-new Date(t))/864e5);
// or
const diff=(a,b)=>(new Date(a)-new Date(b))/864e5|0;
// use
diff('1/1/2001', '1/1/2000')
const diff=(e,t)=>Math.floor((new Date(e).getTime()-new Date(t).getTime())/86400000);
答案 28 :(得分:1)
1970年1月1日之前和2038年1月19日之后的捐款
function DateDiff(aDate1, aDate2) {
let dDay = 0;
this.isBissexto = (aYear) => {
return (aYear % 4 == 0 && aYear % 100 != 0) || (aYear % 400 == 0);
};
this.getDayOfYear = (aDate) => {
let count = 0;
for (let m = 0; m < aDate.getUTCMonth(); m++) {
count += m == 1 ? this.isBissexto(aDate.getUTCFullYear()) ? 29 : 28 : /(3|5|8|10)/.test(m) ? 30 : 31;
}
count += aDate.getUTCDate();
return count;
};
this.toDays = () => {
return dDay;
};
(() => {
let startDate = aDate1.getTime() <= aDate2.getTime() ? new Date(aDate1.toISOString()) : new Date(aDate2.toISOString());
let endDate = aDate1.getTime() <= aDate2.getTime() ? new Date(aDate2.toISOString()) : new Date(aDate1.toISOString());
while (startDate.getUTCFullYear() != endDate.getUTCFullYear()) {
dDay += (this.isBissexto(startDate.getFullYear())? 366 : 365) - this.getDayOfYear(startDate) + 1;
startDate = new Date(startDate.getUTCFullYear()+1, 0, 1);
}
dDay += this.getDayOfYear(endDate) - this.getDayOfYear(startDate);
})();
}
答案 29 :(得分:1)
忽略时间部分
如果两个日期相同,它将返回0。
function dayDiff(firstDate, secondDate) {
firstDate = new Date(firstDate);
secondDate = new Date(secondDate);
if (!isNaN(firstDate) && !isNaN(secondDate)) {
firstDate.setHours(0, 0, 0, 0); //ignore time part
secondDate.setHours(0, 0, 0, 0); //ignore time part
var dayDiff = secondDate - firstDate;
dayDiff = dayDiff / 86400000; // divide by milisec in one day
console.log(dayDiff);
} else {
console.log("Enter valid date.");
}
}
$(document).ready(function() {
$('input[type=datetime]').datepicker({
dateFormat: "mm/dd/yy",
changeMonth: true,
changeYear: true
});
$("#button").click(function() {
dayDiff($('#first').val(), $('#second').val());
});
});
&#13;
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<script src="//code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<input type="datetime" id="first" value="12/28/2016" />
<input type="datetime" id="second" value="12/28/2017" />
<input type="button" id="button" value="Calculate">
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答案 30 :(得分:0)
这个答案基于另一个答案(最后的链接),是关于两个日期之间的差异
你可以看到它是如何工作的,因为它很简单,还包括将差异分成
时间单位(我所做的功能)并转换为UTC以停止时区问题。
function date_units_diff(a, b, unit_amounts) {
var split_to_whole_units = function (milliseconds, unit_amounts) {
// unit_amounts = list/array of amounts of milliseconds in a
// second, seconds in a minute, etc., for example "[1000, 60]".
time_data = [milliseconds];
for (i = 0; i < unit_amounts.length; i++) {
time_data.push(parseInt(time_data[i] / unit_amounts[i]));
time_data[i] = time_data[i] % unit_amounts[i];
}; return time_data.reverse();
}; if (unit_amounts == undefined) {
unit_amounts = [1000, 60, 60, 24];
};
var utc_a = new Date(a.toUTCString());
var utc_b = new Date(b.toUTCString());
var diff = (utc_b - utc_a);
return split_to_whole_units(diff, unit_amounts);
}
// Example of use:
var d = date_units_diff(new Date(2010, 0, 1, 0, 0, 0, 0), new Date()).slice(0,-2);
document.write("In difference: 0 days, 1 hours, 2 minutes.".replace(
/0|1|2/g, function (x) {return String( d[Number(x)] );} ));
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可以使用Date对象计算日期/时间差(以毫秒为单位):
var a = new Date(); // Current date now.
var b = new Date(2010, 0, 1, 0, 0, 0, 0); // Start of 2010.
var utc_a = new Date(a.toUTCString());
var utc_b = new Date(b.toUTCString());
var diff = (utc_b - utc_a); // The difference as milliseconds.
然后计算出该差异中的秒数,除以1000以转换为
毫秒到秒,然后将结果更改为整数(整数)以删除
毫秒(小数的一部分):var seconds = parseInt(diff/1000)
。
此外,我可以使用相同的过程获得更长的时间单位,例如:
- (整个)分钟,将秒除以60并将结果更改为整数,
- 小时,将分钟除以60并将结果更改为整数。
我创建了一个函数,用于执行将差异拆分为
的过程
整个时间单位,名为split_to_whole_units
,使用此演示:
console.log(split_to_whole_units(72000, [1000, 60]));
// -> [1,12,0] # 1 (whole) minute, 12 seconds, 0 milliseconds.
此答案基于this other one。
答案 31 :(得分:0)
我只有两个时间戳,以毫秒为单位,所以我必须用moment.js做一些额外的步骤以获得它们之间的日子。
const getDaysDiff = (fromTimestamp, toTimestamp) => {
// set timezone offset with utcOffset if needed
let fromDate = moment(fromTimestamp).utcOffset(8);
let toDate = moment(toTimestamp).utcOffset(8);
// get the start moment of the day
fromDate.set({'hour':0, 'minute': 0, 'second': 0, 'millisecond': 0});
toDate.set({'hour':0, 'minute': 0, 'second': 0, 'millisecond': 0});
let diffDays = toDate.diff(fromDate, 'days');
return diffDays;
}
getDaysDiff(1528889400000, 1528944180000)// 1
答案 32 :(得分:0)
我遇到了同样的问题,但是最好在SQL Query上完成它:
DateDiff(DAY, StartValue,GETDATE()) AS CountDays
查询将自动生成列CountDays
答案 33 :(得分:0)
我从其他答案中得到了一些启发,并使输入内容具有自动卫生功能。我希望这可以很好地改善其他答案。
//use best practices by labeling your constants.
let MS_PER_SEC = 1000
, SEC_PER_HR = 60 * 60
, HR_PER_DAY = 24
, MS_PER_DAY = MS_PER_SEC * SEC_PER_HR * HR_PER_DAY
;
//let's assume we get Date objects as arguments, otherwise return 0.
function dateDiffInDays(date1, date2) {
if (!date1 || !date2) {
return 0;
}
return Math.round((date2.getTime() - date1.getTime()) / MS_PER_DAY);
}
// new Date("dateString") is browser-dependent and discouraged, so we'll write
// a simple parse function for U.S. date format. (by @Miles)
function parseDate(str) {
if (str && str.length > 5 && str.length < 10) {
let mdy = str.split('/');
return new Date(mdy[2], mdy[0]-1, mdy[1]);
}
return null;
}
function calcInputs() {
let date1 = document.getElementById("date1")
, date2 = document.getElementById("date2")
, resultSpan = document.getElementById("result")
;
if (date1 && date2 && resultSpan) {
//remove non-date characters
let date1Val = date1.value.replace(/[^\d\/]/g,'')
, date2Val = date2.value.replace(/[^\d\/]/g,'')
, result = dateDiffInDays(parseDate(date1Val), parseDate(date2Val))
;
date1.value = date1Val;
date2.value = date2Val;
resultSpan.innerHTML = result + " days";
}
}
window.onload = function() { calcInputs(); };
//some code examples
console.log(dateDiffInDays(parseDate("1/15/2019"), parseDate("1/30/2019")));
console.log(dateDiffInDays(parseDate("1/15/2019"), parseDate("2/30/2019")));
console.log(dateDiffInDays(parseDate("1/15/2000"), parseDate("1/15/2019")));
<input id="date1" type="text" value="1/1/2000" size="6" onkeyup="calcInputs();" />
<input id="date2" type="text" value="1/1/2019" size="6" onkeyup="calcInputs();"/>
Result: <span id="result"></span>
答案 34 :(得分:0)
简单易用。每1秒钟调用一次此函数以更新时间。
const year = (new Date().getFullYear());
const bdayDate = new Date("04,11,2019").getTime(); //mmddyyyy
// countdown
let timer = setInterval(function() {
// get today's date
const today = new Date().getTime();
// get the difference
const diff = bdayDate - today;
// math
let days = Math.floor(diff / (1000 * 60 * 60 * 24));
let hours = Math.floor((diff % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
let minutes = Math.floor((diff % (1000 * 60 * 60)) / (1000 * 60));
let seconds = Math.floor((diff % (1000 * 60)) / 1000);
}, 1000);
答案 35 :(得分:0)
在这种情况下,使用时间会容易得多,您可以尝试以下方法:
let days = moment(yourFirstDateString).diff(moment(yourSecondDateString), 'days');
它将为您提供1,2,5,0等整数值,因此您可以轻松使用条件检查,如:
if(days < 1) {
另外,还有一件事是您可以使用以下语法获得更精确的时间差结果(以小数形式表示,如1.2、1.5、0.7等)
let days = moment(yourFirstDateString).diff(moment(yourSecondDateString), 'days', true);
让我知道您是否还有任何疑问
答案 36 :(得分:0)
如果我们要计算年龄,则答案有点不同
{
birthday: 'April 22, 1993',
names: {
first: 'Keith',
last: 'Buckley'
}
},
{
birthday: 'January 3, 1975',
names: {
first: 'Larry',
last: 'Heep'
}
},
{
birthday: 'February 12, 1944',
names: {
first: 'Linda',
last: 'Bermeer'
}
}
];
const cleanPeople = people.map(function ({birthday, names:{first, last}}) {
// birthday, age, fullName;
const now = new Date();
var age = Math.floor(( Date.parse(now) - Date.parse(birthday)) / 31536000000);
return {
age,
fullName:`${first} ${last}`
}
});
console.log(cleanPeople);
console.table(cleanPeople);
答案 37 :(得分:0)
其他答案的Bookmarklet版本,提示您注明这两个日期:
javascript:(function() {
var d = new Date(prompt("First Date or leave blank for today?") || Date.now());
prompt("Days Between", Math.round(
Math.abs(
(d.getTime() - new Date(prompt("Date 2")).getTime())
/(24*60*60*1000)
)
));
})();
答案 38 :(得分:0)
您可以使用UnderscoreJS进行格式化和计算差异。
演示 https://jsfiddle.net/sumitridhal/8sv94msp/
var startDate = moment("2016-08-29T23:35:01");
var endDate = moment("2016-08-30T23:35:01");
console.log(startDate);
console.log(endDate);
var resultHours = endDate.diff(startDate, 'hours', true);
document.body.innerHTML = "";
document.body.appendChild(document.createTextNode(resultHours));
body { white-space: pre; font-family: monospace; }
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.5.1/moment.min.js"></script>
答案 39 :(得分:0)
function validateDate() {
// get dates from input fields
var startDate = $("#startDate").val();
var endDate = $("#endDate").val();
var sdate = startDate.split("-");
var edate = endDate.split("-");
var diffd = (edate[2] - sdate[2]) + 1;
var leap = [ 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ];
var nonleap = [ 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ];
if (sdate[0] > edate[0]) {
alert("Please enter End Date Year greater than Start Date Year");
document.getElementById("endDate").value = "";
diffd = "";
} else if (sdate[1] > edate[1]) {
alert("Please enter End Date month greater than Start Date month");
document.getElementById("endDate").value = "";
diffd = "";
} else if (sdate[2] > edate[2]) {
alert("Please enter End Date greater than Start Date");
document.getElementById("endDate").value = "";
diffd = "";
} else {
if (sdate[0] / 4 == 0) {
while (sdate[1] < edate[1]) {
diffd = diffd + leap[sdate[1]++];
}
} else {
while (sdate[1] < edate[1]) {
diffd = diffd + nonleap[sdate[1]++];
}
}
document.getElementById("numberOfDays").value = diffd;
}
}