Invalid date

[unlikenesses]

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

Bug report

Steps to reproduce

• [ ] I prepared a reproduction repo, here is the reproduction repo:

• [x] This issue doesn't need a reproduction repro, here is the steps to reproduce

1. yarn create vuepress
2. yarn install
3. Edit a post. Change the date of the post to 2019-11-30.
4. yarn dev
5. Go to localhost:8080
6. Instead of seeing "30 November 2019", you see "Invalid date".

What is expected?

When a post has a date in the front matter, it should be rendered correctly.

What is actually happening?

For some dates, e.g. 2019-11-30, instead of the date, the string "Invalid date" is shown.

Other relevant information

• npx vuepress info:

  System: OS: Windows 8.1 6.3.9600 CPU: (4) x64 Intel(R) Core(TM) i7-4500U CPU @ 1.80GHz Binaries: Node: 8.11.2 - C:\Program Files\nodejs\node.EXE Yarn: 1.6.0 - C:\Program Files (x86)\Yarn\bin\yarn.CMD npm: 6.0.1 - C:\Program Files\nodejs\npm.CMD npmPackages: @vuepress/core: Not Found @vuepress/theme-default: Not Found vuepress: ^1.0.0 => 1.2.0 npmGlobalPackages: vuepress: Not Found

[billyyyyy3320]

Thanks for report. Contribution Welcome.

[cireu]

I found that if I use "YYYY-MM-DD" instead of YYYY-MM-DD, it can be render correctly. I will try to resolve this.

[cireu]

@newsbielt703 Please check #27

[himself65]

I think we can use package moment-js, and allow users to modify themself's date formate