data-scalar-type.md

First you have to define the scalar type in the GraphQL schema:

scalar Date

Then you have to provide a resolver for the scalar type. Here's an example implementation using Luxon:

import { DateTime } from 'luxon';

makeExecutableSchema({
  typeDefs: typeDefs,
  resolvers: {
    Date: new GraphQLScalarType({
      name: 'Date',
      description: 'Date custom scalar type',
      parseValue(value) {
        return DateTime.fromISO(value);
      },
      serialize(value) {
        return value.toUTC().toISO();
      },
      parseLiteral(ast) {
        if (ast.kind === Kind.STRING) {
          return DateTime.fromISO(ast.value);
        }
        return null;
      },
    }),
  },
  // Rest of the resolvers / mutators / queries here
});

@MikeRyanDev this makes sense on the server side and works. You also need to add the resolver for Date to the client, right?