createAt/updateAt is of different types for CSR and SSR

[odanado]

Version

@nuxt/content: 1.3.1
nuxt: 2.12.2

Reproduction Link

https://github.com/odan-sandbox/nuxtjs-content-date-hydration-reproduction

Steps to reproduce

1. yarn
2. yarn dev
3. open localhost:3000
4. change a mode from spa to universal in nuxt.config.js
5. open localhost:3000

What is Expected?

I get the same display.

What is actually happening?

I got a different display.

• When universal mode
  • Sun Jun 07 2020 03:37:06 GMT+0900 (日本標準時) object
• When spa mode
  • 2020-06-06T18:37:06.335Z string

[odanado]

In addition, the same bug occurs for custom properties of date types.
e.g. publishedAt
ref: https://github.com/odan-sandbox/nuxtjs-content-date-hydration-reproduction/blob/4b3f99217bc63b4bcacad8b84bf86b1895249a24/pages/index.vue#L11

[dwfee]

same here