Fix use local timezone unintentionally when parse date from filename

[knokmki612]

Step to reproduce (What is the problem)

Demo: https://knokmki612.github.io/sandbox-11ty/

$ git clone https://github.com/knokmki612/sandbox-11ty.git
$ cd sandbox-11ty
$ yarn install
$ yarn eleventy
$ cat _site/parse-date-from-front-matter/index.html

<h1>Parse date from front matter</h1>

<p>date: Fri, 30 Apr 2021 00:00:00 GMT</p>
$ cat _site/2021-04-30/index.html

<h1>Parse date from filename</h1>

<p>date: Thu, 29 Apr 2021 15:00:00 GMT</p>

Doesn't match the results of date parsing between front-matter and filename.

This caused by unspecified the UTC timezone when parse date from filename.

According to official document, page.date must be the midnight of UTC
(in case of above example: Fri, 30 Apr 2021 00:00:00 GMT)

Environment

• My timezone: Asia/Tokyo (GMT +09:00)

[zachleat]

Good catch, thank you!

[zachleat]

Looks like this broke a test locally but not on GitHub actions 😱

I filed a bug with the liquidjs library, I guess we were relying on this local timezone to pass into the liquid date filter: harttle/liquidjs#375

[zachleat]

For future me, here’s the test that broke:

2016-02-01-permalinkdate.liquid:

---
title: Date Permalink
permalink: "/{{ page.date | date: '%Y/%m/%d' }}/index.html"
---
Date Permalinks