graphql-compose/es/type/date.js

GraphQL schema builder from different data sources with middleware extensions.

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

export default new GraphQLScalarType({
  name: 'Date',
  serialize: function serialize(value) {
    if (typeof value === 'string' && /^(\d{4})-(\d{2})-(\d{2})T((\d{2}):(\d{2}):(\d{2}))\.(\d{3})Z$/.test(value)) {
      return value;
    }

    if (!(value instanceof Date)) {
      throw new TypeError('Field error: value is not an instance of Date');
    }

    if (isNaN(value.getTime())) {
      throw new TypeError('Field error: value is an invalid Date');
    }

    return value.toJSON();
  },
  parseValue: function parseValue(value) {
    var date = new Date(value);

    if (isNaN(date.getTime())) {
      throw new TypeError('Field error: value is an invalid Date');
    }

    return date;
  },
  parseLiteral: function parseLiteral(ast) {
    if (ast.kind !== Kind.STRING) {
      throw new GraphQLError('Query error: Can only parse strings to buffers but got a: ' + ast.kind, [ast]);
    }

    var result = new Date(ast.value);
    if (isNaN(result.getTime())) {
      throw new GraphQLError('Query error: Invalid date', [ast]);
    }

    if (ast.value !== result.toJSON()) {
      throw new GraphQLError('Query error: Invalid date format, only accepts: YYYY-MM-DDTHH:MM:SS.SSSZ', [ast]);
    }

    return result;
  }
});