How can I change the Unix time into a date format within a GraphQL query using Grafana?

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There are a few ways to convert Unix time to a date format within a GraphQL query using Grafana:

1. Use Unix timestamp scalar converter: In GraphQL, there is a scalar type called "Unix timestamp" that can be used to represent a Unix timestamp in seconds (i.e., the number of seconds since January 1, 1970, 00:00:00 UTC). You can convert this timestamp to a date format by using a GraphQL query like this:

query {
  myData {
    timestamp
    date: timestamp @scalar(type: "UnixTimestamp")
  }
}

Here, we are using the alias "date" to represent the Unix timestamp converted into a date format.

1. Use a custom scalar converter: If the built-in Unix timestamp scalar converter does not meet your needs, you can define a custom scalar converter using the "scalar" directive in your GraphQL schema. For example, you can define a custom scalar "Date" that converts a Unix timestamp to a date string using the "format" function from the "date-fns" library:

scalar Date

type MyData {
  timestamp: Int!
  date: Date
}

type Query {
  myData: [MyData]
}

directive @scalar(type: String!) on FIELD_DEFINITION

schema {
  query: Query
}

Then, you can use the "format" function to convert the Unix timestamp to a date string in your resolver function:

const { format } = require('date-fns')

const resolvers = {
  Query: {
    myData: () => {
      return [
        { timestamp: 1615888379 },
        { timestamp: 1615888380 }
      ]
    }
  },
  MyData: {
    date: (parent) => {
      return format(new Date(parent.timestamp * 1000), 'MM/dd/yyyy')
    }
  }
}

Here, we are using the "format" function to format the Unix timestamp as "MM/dd/yyyy" (e.g., "03/16/2021"). Note that we are multiplying the timestamp by 1000 to convert it from seconds to milliseconds, which is the required format for the Date constructor.

1. Use Grafana's built-in date formatting functions: If you are using Grafana to display the results of your GraphQL query, you can use Grafana's built-in date formatting functions to convert Unix timestamps to date strings. For example, you can use the "date" function to format the timestamp as a human-readable date:

query {
  myData {
    timestamp
    date: timestamp @transform(type: "date", format: "LLL")
  }
}

Here, we are using the "transform" directive to apply the "date" function to the "timestamp" field and format it as "LLL" (e.g., "March 16, 2021 9:26 PM"). You can find more information about Grafana's date formatting functions in the official documentation.