作为正在进行的项目的一部分，我需要寻找并抓住日期＆amp;来自网页的时间数据。
然而，虽然出现是日期和时间的某些约定。时间格式，例如Dublin Core Metadata Initiative，采用率很差，遵守情况充其量是不一致的。
答案 0 :(得分：-2)
我绝不是JavaScript或jQuery专家，但我拥有持久性的超级大国，而且我所写的是有效的，可用于Gist on GitHub分叉：
$(document).ready(function(){
var objDateTimeTags = new Object({
// The Dublin Core Metadata Initiative (DCMI) ( http://dublincore.org/about-us/ ).
option1: function () {
var datetime_published = $("meta[name='DC.Date']").attr("content");
return validation(datetime_published);
},
option2: function () {
var datetime_published = $("dc\\:date").text();
return validation(datetime_published);
},
/**
* Sources include:
* - IFL Science ( http://www.iflscience.com/ );
* - Popular Mechanics ( http://www.popularmechanics.com/ );
* - The Guardian ( http://www.theguardian.com/ );
* - Laughing Squid ( http://laughingsquid.com/ );
* - Fast Company ( http://www.fastcocreate.com/ ).
*/
option3: function () {
var datetime_published = $("meta[property='article:published_time']").attr("content");
return validation(datetime_published);
},
/**
* Sources include:
* - New York Times ( http://www.nytimes.com/ ).
*/
option4: function () {
var datetime_published = $("meta[name='ptime']").attr("content");
var datetime_published_formatted = function(datetime) {
// Example: 20140911212613, which is equivalent to: 2014-09-11T21:26:13
if ( (typeof datetime !== 'undefined') && (datetime.length === 14) ) {
// Date.
var yyyy = datetime.slice(0, 4);
var mm = datetime.slice(4, 6);
var dd = datetime.slice(6, 8);
// Time.
var hours = datetime.slice(8, 10);
var minutes = datetime.slice(10, 12);
var seconds = datetime.slice(12, 14);
// Date & Time.
return datetime = yyyy + '-' + mm + '-' + dd + 'T' + hours + ':' + minutes + ':' + seconds;
} else {
return false;
}
};
var datetime_published = datetime_published_formatted(datetime_published);
return validation(datetime_published);
},
/**
* Sources include:
* - Science Magazine ( http://news.sciencemag.org/ );
* - Politico ( http://www.politico.com/ ).
*/
option5: function () {
var datetime_published = $("time").attr("datetime");
return validation(datetime_published);
},
/**
* Sources include:
* - BBC News ( http://www.bbc.com/news ).
*/
option6: function () {
var datetime_published = $('.date').data("seconds") * 1000;
return validation(datetime_published);
},
/**
* Sources include:
* - Business Insider ( http://www.businessinsider.com/ ).
*/
option7: function () {
var datetime_published = $("span[data-bi-format='date']").attr('rel') * 1000;
return validation(datetime_published);
},
/**
* Reference: https://www.parsely.com/docs/integration/metadata/ppage.html
* Sources include:
* - Ars Technica ( http://arstechnica.com/ );
* - The Next Web ( http://thenextweb.com/ );
* - Live Science ( http://www.livescience.com/ );
* - The Atlantic ( http://www.theatlantic.com/ );
* - The Slate ( http://www.slate.com/ ).
*/
option8: function () {
var json = $.parseJSON( ( $("meta[name='parsely-page']").attr("content") ) ? $("meta[name='parsely-page']").attr("content") : false );
var datetime_published_formatted = function(datetime) {
/**
* Examples include:
* - 2015-12-28T20:10:25Z
* - 2015-12-22 at 08:05:00AM EST
*/
if ( typeof datetime !== 'undefined' ) {
if ( /\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}?Z/.test(datetime) ) {
return datetime;
} else if ( /\d{4}-\d{2}-\d{2} at \d{2}:\d{2}:\d{2}\w{3} \w{3}/.test(datetime) ) {
var arrdt = datetime.split(' at ');
// Date.
var d = arrdt[0];
// Time.
var t = arrdt[1].slice(0, 8);
// Date & Time.
return d + 'T' + t;
}
return false;
}
};
var datetime_published = datetime_published_formatted( (typeof json.pub_date !== 'undefined') ? json.pub_date : '' );
return validation(datetime_published);
},
/**
* Sources include:
* - USA Today ( http://www.usatoday.com/ ).
*/
option9: function() {
var datetime_published = $("meta[itemprop='datePublished']").attr("content");
return validation(datetime_published);
},
/**
* Sources include:
* - i09 ( http://io9.gizmodo.com/ ).
*/
option10: function() {
var json = $.parseJSON( ( $("script[type='application/ld+json']").html() ) ? $("script[type='application/ld+json']").html() : false );
return validation( (typeof json.datePublished !== 'undefined') ? json.datePublished : '' );
},
/**
* Sources include:
* - i100 from the Independent ( http://i100.independent.co.uk/ ).
*/
option11: function() {
var datetime_published = $("article").data("releasedate");
return validation(datetime_published);
},
/**
* Sources include:
* - Daily Kos ( http://www.dailykos.com/ ).
*/
option12: function() {
var datetime_published = $("span.timestamp").first().data("epoch-time");
var datetime_published_formatted = function(datetime) {
if ( typeof datetime !== 'undefined' ) {
return datetime.toString().slice(0, 10) * 1000;
} else {
return false;
}
};
return validation(datetime_published_formatted(datetime_published));
},
/**
* Sources include:
* - Vanity Fair ( http://www.vanityfair.com/ ).
*/
option13: function() {
var datetime_published = $("meta[name='pubdate']").attr("content");
return validation(datetime_published);
}
});
// Helper functions.
Date.prototype.getUnixTime = function() { return this.getTime() / 1000|0 };
function validation (datetime) {
return ( (new Date( datetime )) > 0 ) ? (new Date( datetime ).getUnixTime()) : '';
}
// Reference: https://gist.github.com/kmaida/6045266
function get_timestamp_from_unix_epoch (datetime) {
// Example: 1449854274, which is equivalent to: 2015-12-11 17:17:54
if ( (typeof datetime !== 'undefined') && (datetime.length === 10) ) {
var dt = new Date(datetime * 1000), // Convert the passed timestamp to milliseconds
// Date.
yyyy = dt.getFullYear(),
mm = ('0' + (dt.getMonth() + 1)).slice(-2), // Months are zero based, so add a leading 0.
dd = ('0' + dt.getDate()).slice(-2), // Add leading 0.
// Time.
hours = dt.getHours(),
minutes = ('0' + dt.getMinutes()).slice(-2), // Add leading 0.
seconds = ('0' + dt.getSeconds()).slice(-2), // Add leading 0.
time;
// Date & Time.
return time = yyyy + '-' + mm + '-' + dd + ' ' + hours + ':' + minutes + ':' + seconds;
} else {
return false;
}
}
function getDatePublication () {
var datetime;
for (var key in objDateTimeTags) {
datetime = get_timestamp_from_unix_epoch( objDateTimeTags[key]().toString() );
if (datetime !== false) break;
}
// A default value, in the event no date & time value is found.
return (datetime) ? datetime : '0000-00-00 00:00:00';
}
alert ( getDatePublication() );
});