• I confirm that this is an issue rather than a question.

Bug report

Current permalink generation from date frontmatter field is using a simple split on - characters. When using other formats of date (that is able to be parsed by Date), the permalink fails to generate. I noticed that this change was due to a flaw in the Date API (#2181). If so, please use a date library (e.g. dayjs) instead of rolling an error-prone parser.

The same problem is present in vuepress-next.

Steps to reproduce

Put this in a file:

---
date: Thu May 06 2021 18:10:16 GMT+0800 (中国标准时间)
permalink: /:year/:month/:day/:slug
---

What is expected?

Page is at /2021/05/06/....

What is actually happening?

Page is at /NaN/NaN/NaN/....

Other relevant information

• Output of npx vuepress info in my VuePress project:

Environment Info:

  System:
    OS: macOS 10.15.7
    CPU: (8) x64 Intel(R) Core(TM) i7-4870HQ CPU @ 2.50GHz
  Binaries:
    Node: 14.15.5 - /usr/local/bin/node
    Yarn: 1.13.0 - /usr/local/bin/yarn
    npm: 7.13.0 - /usr/local/bin/npm
  Browsers:
    Chrome: 93.0.4549.4
    Edge: Not Found
    Firefox: 62.0.3
    Safari: 14.0.3
  npmPackages:
    @vuepress/core:  1.8.2 
    @vuepress/theme-default:  1.8.2 
    vuepress: ^1.8.2 => 1.8.2 
  npmGlobalPackages:
    vuepress: Not Found