Gatsby: Unknown argument `formatString`

[ahmedelgabri]

If I try to use formatString on the date from frontmatter here, it shows this error

It doesn't work even in the graphql console

[secretfader]

You might try formatting the date field to something a bit more standard and see if that helps. I've had intermittent issues with date fields before, and tweaking the formatting usually helps.

[KyleAMathews]

Yeah, a string has to be a standard date format for the various date formatting options to be added.

[ahmedelgabri]

cool, thanks @nicholaswyoung & @KyleAMathews

[daviddeejjames]

@KyleAMathews If I am using this with the Wordpress REST API, how do I ensure its being returned as a string, looking at the example in the Gatsby repo it seems that it kinda just works?

EDIT: To clarify I receive a date without using the formatString function, however I get the error mentioned here when attempting to format it (including using GraphIQL console)

[KyleAMathews]

Try using gatsby-source-wordpress which handles this for you.

[daviddeejjames]

@KyleAMathews sorry I should have clarified I am using gatsby-source-wordpress and have created a blog page that uses the GraphQL query below. It works as intended! But would like to format the date without having to use something like MomentJS to format after the fact. However by adding the date(formatString: "MMMM DD, YY") that you have used in your Wordpress example, I am thrown the Unknown argument "formatString"

Any assistance with this issue would be greatly appreciated 👍

// Working Query
export const postQuery = graphql`
  query getPostQuery {
    allWordpressPost(sort: { fields: [date] }) {
      edges {
        node {
          id
          title
          excerpt
          slug
          date
        }
      }
    }
  }`

[KyleAMathews]

This just means that for some reason the data in your "date" field doesn't look dates to Gatsby. You'll need to do some debugging to see what your data looks like. Also might want to add some console.logs here https://github.com/gatsbyjs/gatsby/blob/8e271dac240c9374c654d1576fefafe4319cb314/packages/gatsby-source-wordpress/src/normalize.js#L108 Perhaps the WordPress API doesn't always include *_gmt fields.

[andrejarboe]

date must be: 2000-01-01
NOT: 2000-1-1

that was my problem