mgs-graphql/lib/type/graphql/Date.js

The simple way to generates GraphQL schemas and Sequelize models from your models definition,microservice supported

// @flow

const {GraphQLScalarType, GraphQLError, Kind} = require('graphql')
const moment = require('moment')
module.exports = new GraphQLScalarType({
  name: 'Date',

  serialize (value) {
    if (typeof value === 'string') {
      const nValue = moment(value, 'YYYY-MM-DD HH:mm:ss.SSS ZZ')
      if (nValue.isValid()) {
        value = nValue.toDate()
      }
    }
    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 (value) {
    if (typeof value === 'string') {
      const result = moment(value)
      if (!result.isValid()) {
        throw new GraphQLError('Query error: Invalid date')
      }
      return result.toDate()
    } else {
      throw new GraphQLError('Query error: Invalid date')
    }
  },

  parseLiteral (ast) {
    if (ast.kind !== Kind.STRING) {
      throw new GraphQLError('Query error: Can only parse strings to dates but got a: ' + ast.kind, [ast])
    }
    const result = moment(ast.value)
    if (!result.isValid()) {
      throw new GraphQLError('Query error: Invalid date', [ast])
    }
    return result.toDate()

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