Javascript jQuery/JS - 如何比较两个日期/时间戳？
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jQuery/JS - How to compare two date/time stamps?
提问by AnApprentice
I have two date/time stamps:
我有两个日期/时间戳：
d1 = 2011-03-02T15:30:18-08:00
d2 = 2011-03-02T15:36:05-08:00
I want to be above to compare the two:
我想在上面比较两者：
if (new Date(d1) < new Date(d2)) {alert('newer')}
But that does not appear to be working correctly. Is there a way to compare not just the dates but the times as well.? thanks
但这似乎不能正常工作。有没有办法不仅可以比较日期，还可以比较时间。？谢谢
UPDATE:
更新：
console.log(d1 + ' ' + d2);
console.log(new Date(d1) > new Date(d2))
2011-03-02T15:30:18-08:00 2011-03-02T15:36:05-08:00
false
2011-03-02T15:30:18-08:00 2011-03-02T15:30:18-08:00
false
2011-03-02T15:30:18-08:00 2011-03-02T14:15:04-08:00
false
回答by user113716
Your timestamps should be strings.
您的时间戳应该是字符串。
var d1 = "2011-03-02T15:30:18-08:00";
var d2 = "2011-03-02T15:36:05-08:00";
if (new Date(d1) < new Date(d2)) {alert('newer')}
Example:http://jsfiddle.net/hKPkF/
回答by madsj
You may be having trouble with the date string format. I am getting Invalid date if I do:
您可能在日期字符串格式方面遇到问题。如果我这样做，我会收到无效日期：
new Date("2011-03-02T15:30:18-08:00");
Here's what works for me on Chrome:
以下是在 Chrome 上对我有用的内容：
var d1 = "Thu Mar 03 2011 00:53:54 GMT+0100 (CET)";
var d2 = "Thu Mar 03 2011 03:53:54 GMT+0100 (CET)";
if (new Date(d1) < new Date(d2)) {console.log('newer')}
If you are working in ruby on the server side, you could convert to UTC from a Timeobject. Here it is, with a little massaging to convert to a format that is identical to javascript's Date object toUTCStringmethod:
如果您在服务器端使用 ruby，则可以从Time对象转换为 UTC 。在这里，只需稍加按摩即可转换为与 javascript 的 Date 对象toUTCString方法相同的格式：
tm = Time.new
utc_tm = tm.getutc
utc_tm.strftime("%a, %d %b %Y %H:%M:%S GMT")
Output: "Thu, 03 Mar 2011 00:46:55 GMT"
输出： "Thu, 03 Mar 2011 00:46:55 GMT"
回答by Jeff B
Seems to work fine for me, although you have to format correctly (i.e. semicolons, quotes):
对我来说似乎工作正常，尽管您必须正确格式化（即分号、引号）：
var d1 = "2011-03-02T15:30:18-08:00";
var d2 = "2011-03-02T15:36:05-08:00";
if(new Date(d1) < new Date(d2)) {alert('newer')};
And yes, it takes time into account. If you do this:
是的，这需要考虑时间。如果你这样做：
alert(new Date(d1) - new Date(d2));
You get 347000, which is 347 seconds, or 5 minutes, 47 seconds. This is the correct difference between the two.
你得到 347000，即 347 秒，或 5 分 47 秒。这是两者之间的正确区别。
回答by kennebec
var d1= '2011-03-02T15:30:18-08:00', d2= '2011-03-02T15:36:05-08:00'; Some browsers can convert an ISO string to a Date, with new Date or Date.parse.
var d1='2011-03-02T15:30:18-08:00', d2='2011-03-02T15:36:05-08:00'; 一些浏览器可以将 ISO 字符串转换为日期，使用 new Date 或 Date.parse。
A lot of browsers in use today cannot-you may need to write your own conversion.
今天使用的许多浏览器都不能-您可能需要编写自己的转换。
This one seems to work, but it'll need refining. I added a shim for browsers that don't have an array.map, based on mozilla org's public code.
这个似乎有效，但需要改进。我为没有 array.map 的浏览器添加了一个 shim，基于 mozilla org 的公共代码。
Date.fromISO= function(s){
var day, tz,
rx= /^(\d{4}\-\d\d\-\d\d([tT][\d:\.]*)?)([zZ]|([+\-])(\d\d):(\d\d))?$/,
p= rx.exec(s) || [];
if(p[1]){
day= p[1].split(/\D/).map(function(itm){
return parseInt(itm, 10) || 0;
});
day[1]-= 1;
day= new Date(Date.UTC.apply(Date, day));
if(!day.getDate()) return NaN;
if(p[5]){
tz= parseInt(p[5], 10)*60;
if(p[6]) tz += parseInt(p[6], 10);
if(p[4]== "+") tz*= -1;
if(tz) day.setUTCMinutes(day.getUTCMinutes()+ tz);
}
return day;
}
return NaN;
}
Array.prototype.map= Array.prototype.map || function(fun, scope){
var L= this.length, A= [], i= 0;
if(typeof fun== 'function'){
while(i< L){
if(i in this) A[i]= fun.call(scope, this[i], i, this);
++i;
}
return A;
}
}
var d1= '2011-03-02T15:30:18-08:00', d2= '2011-03-02T15:36:05-08:00';
alert(Date.fromISO(d1)-Date.fromISO(d2)+' milliseconds')
回答by iivel
Given the differences in date formats and capability between browsers, I'd really reccomend you use a library devoted to DateTime handling. JS support for it is notoriously horrendous. I'm a HUGE fan of date.js
鉴于浏览器之间日期格式和功能的差异，我真的建议您使用专门用于 DateTime 处理的库。JS 对它的支持是出了名的可怕。我是 date.js 的超级粉丝
