Front Matter: inconsistent date property

[Hill-98]

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

Bug report

As shown, if a two-digit date, $frontmatter.date have different performance behaviors.

This problem affects how the subject developer handles time

Steps to reproduce

https://github.com/Hill-98/vuepress-frontmatter-test

What is expected?

Same $frontmatter.date

What is actually happening?

Different $frontmatter.date

Other relevant information

NodeJS: 13.5.0

Browser: Chrome Canary 81

VuePress: 1.2.0

[billyyyyy3320]

Hi @Hill-98,

FYI, VuePress' using gray-matter which depends js-yaml which follows standard yaml types, so all available formats are here.

Currently, we've handled both 2-digits and single-digit in default blog theme, but if it's possible, we should support both format in VuePress.

[Hill-98]

I think in all writing formats, the date attribute should return a uniform format.