【发布时间】：2017-01-11 16:22:22
【问题描述】：
我将更新推送到我的 Github Pages 站点，但构建失败。不过在本地它构建得很好。
回购：https://github.com/valeIT/valeIT.github.io/
页面构建失败，出现以下错误：
值“nil”已传递给期望有效的日期相关过滤器
/_layouts/post.html或其布局之一中的日期。更多 信息，见 https://help.github.com/articles/page-build-failed-date-is-not-a-valid-datetime/.有关 Jekyll 故障排除的信息，请参阅：
https://help.github.com/articles/troubleshooting-jekyll-builds
我查看了“/_layouts/post.html”，但我对 Liquid 的了解非常基础，看不出其中有什么问题。
post.html 的内容：
---
---
<!DOCTYPE html>
<html>
{% include head.html %}
<body itemscope itemtype="http://schema.org/Article">
{% include header.html %}
<main class="content" role="main">
<article class="post">
{% if page.image %}
<div class="article-image">
<div class="post-image-image" style="background-image: url({% if page.image %}{{ page.image }}{% endif %})">
Article Image
</div>
<div class="post-image-image2" style="background-image: url({% if page.image2 %}{{ page.image2 }}{% endif %})">
Article Image
</div>
<div class="post-meta">
<h1 class="post-title">{{ page.title }}</h1>
<div class="cf post-meta-text">
<div class="author-image" style="background-image: url({{ site.author_image }})">Blog Logo</div>
<h4 class="author-name" itemprop="author" itemscope itemtype="http://schema.org/Person">{{ site.author }}</h4>
on
<time datetime="{{ page.date | date: "%F %R" }}">{{ page.date | date_to_string }}</time>
<!-- , tagged on {{#foreach tags}}<span class="post-tag-{{slug}}">{{#if @first}}{{else}}, {{/if}}<a href="/tag/{{slug}}">{{name}}</a></span>{{/foreach}} -->
- {{ page.content | number_of_words }} Words - {{ content | reading_time_as_i }}.
</div>
<div style="text-align:center">
<a href="#topofpage" class="topofpage"><i class="fa fa-angle-down"></i></a>
</div>
</div>
</div>
{% else %}
<div class="noarticleimage">
<div class="post-meta">
<h1 class="post-title">{{ page.title }}</h1>
<div class="cf post-meta-text">
<div class="author-image" style="background-image: url({{ site.author_image }})">Blog Logo</div>
<h4 class="author-name" itemprop="author" itemscope itemtype="http://schema.org/Person">{{ page.author }}</h4>
on
<time datetime="{{ page.date | date_to_xmlschema }}">{{ page.date | date_to_string }}</time>
<!-- , tagged on {{#foreach tags}}<span class="post-tag-{{slug}}">{{#if @first}}{{else}}, {{/if}}<a href="/tag/{{slug}}">{{name}}</a></span>{{/foreach}} -->
</div>
</div>
</div>
<br>
<br>
<br>
{% endif %}
<section class="post-content">
<div class="post-reading">
<span class="post-reading-time"></span> read
</div>
<a name="topofpage"></a>
{{content}}
</section>
<footer class="post-footer">
<section class="share">
{% for social in site.social %}
{% if social.share_url != null %}
<a class="icon-{{ social.icon }}" href="{{ social.share_url }}{{ social.share_title }}{{page.title | cgi_escape}}{{ social.share_link }}{{site.url}}{{page.id}}"
onclick="window.open(this.href, '{{ social.icon }}-share', 'width=550,height=255');return false;">
<i class="fa fa-{{ social.icon }}"></i><span class="hidden">{{ social.icon }}</span>
</a>
{% endif %}
{% endfor %}
</section>
</footer>
<div class="bottom-teaser cf">
<div class="isLeft">
<h5 class="index-headline featured"><span>Written by</span></h5>
<section class="author">
<div class="author-image" style="background-image: url({{site.author_image}})">Blog Logo</div>
<h4>{{ site.author }}</h4>
<p class="bio">{{author.bio}}</p>
<hr>
<p class="published">Published <time datetime="{{ page.date | date: "%F %R" }}">{{ page.date | date_to_string }}</time></p>
</section>
</div>
{{/post}}
<div class="isRight">
<h5 class="index-headline featured"><span>Supported by</span></h5>
<footer class="site-footer">
<section class="poweredby"><a href ="{{site.url}}/apps">Check Out My Apps</a></section>
<a class="subscribe" href="{{ "/feed.xml" | prepend: site.baseurl }}"> <span class="tooltip"> <i class="fa fa-rss"></i> You should subscribe to my feed.</span></a>
<div class="inner">
<section class="copyright">All content copyright <a href="{{@blog.url}}/">{{site.author}}</a> © {{ site.time | date: '%Y' }}<br>All rights reserved.</section>
</div>
</footer>
</div>
</div>
{%if site.disqus %}
<div id="disqus_thread"></div>
<script type="text/javascript">
/* * * CONFIGURATION VARIABLES: EDIT BEFORE PASTING INTO YOUR WEBPAGE * * */
var disqus_shortname = '{{site.disqus}}'; // required: replace example with your forum shortname
/* * * DON'T EDIT BELOW THIS LINE * * */
(function() {
var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true;
dsq.src = '//' + disqus_shortname + '.disqus.com/embed.js';
(document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq);
})();
</script>
<noscript>Please enable JavaScript to view the <a href="http://disqus.com/?ref_noscript">comments powered by Disqus.</a></noscript>
{% endif %}
</article>
</main>
<div class="bottom-closer">
<div class="background-closer-image" {%if site.cover %} style="background-image: url({{ site.cover }})"{% endif %}>
Image
</div>
<div class="inner">
<h1 class="blog-title">{{ site.title }}</h1>
<h2 class="blog-description">{{ site.description }}</h2>
<a href="/" class="btn">Back to Overview</a>
</div>
</div>
{% include javascripts.html %}
</body>
</html>
有什么想法吗？
【问题讨论】：