How can I define Date data type in Graphql schema? [duplicate]

Question

I receive LASTUPDATE: 1579443364 response from an external API,
How can I define the data type in the schema in order to convert it to Date format?

Like this format: Mon Jan 19 2020 00:44:04

GraphQL schema language supports:

Int
Float
String
Id
Boolean

Answer 1

You can use a custom scallar that parse the Int into date If you are using apollo server you can try something like this

import { GraphQLScalarType } from 'graphql';
import { Kind } from 'graphql/language';

const resolverMap = {
  Date: new GraphQLScalarType({
    name: 'Date',
    description: 'Date custom scalar type',
    parseValue(value) {
      return new Date(value); // value from the client
    },
    serialize(value) {
      return value.getTime(); // value sent to the client
    },
    parseLiteral(ast) {
      if (ast.kind === Kind.INT) {
        return new Date(ast.value) // ast value is always in string format
      }
      return null;
    },
  }),
};

And then

scalar Date

type MyType {
   created: Date
}

You can take a closer look here https://www.apollographql.com/docs/graphql-tools/scalars/ Here are some other useful scalars https://github.com/Urigo/graphql-scalars

Answer 2

Long answer: you should define a scalar type to represent your date information (as documented and also answered)

Short answer: you may use a 3rd party lib to take care for you (such as https://www.npmjs.com/package/graphql-iso-date (you use node so this one should suit your needs)

Either way, I assume the numeric value is a timestamp so you should use the resolve function to translate this numuber to a valid date