Question regarding example field for date format property

[glodieu]

Hi, I've this Swagger file. Please take a look to the dateOfBirth example fields, both are '1978-06-21'.
But after executing swagger-parser, output is an object and I don't know how obtain original value.
Could you please help me with this?
Thanks.

Swagger file:

info:
  version: 0.0.1
  title: Simple API

paths:
  /persons:
    get:
      responses:
        '200':
          description: A list of Person
          schema:
            $ref: '#/definitions/Persons'
definitions:
  Person:
    title: Human
    properties:
      dateOfBirth:
        type: string
        format: date
        example: 1978-06-21
      lastTimeOnline:
        type: string
        format: date-time
        readOnly: true
        example: 2016-06-10T12:36:58.014Z
  Persons:
    properties:
      items:
        type: array
        items:
          $ref: '#/definitions/Person'
        example:
          - dateOfBirth: 1970-01-28
            lastTimeOnline: 2016-04-10T14:36:58.014Z

Parser output:

    "definitions": {
        "Person": {
            "properties": {
                "dateOfBirth": {
                    "example": "1978-06-21T00:00:00.000Z",
                    "format": "date",
                    "type": "string"
                },
                "lastTimeOnline": {
                    "example": "2016-06-10T12:36:58.014Z",
                    "format": "date-time",
                    "readOnly": true,
                    "type": "string"
                }
            },
            "title": "Human"
        },
        "Persons": {
            "properties": {
                "items": {
                    "example": [
                        {
                            "dateOfBirth": "1970-01-28T00:00:00.000Z",
                            "lastTimeOnline": "2016-04-10T14:36:58.014Z"
                        }
                    ],
                    "items": {
                        "$ref": "#/definitions/Person"
                    },
                    "type": "array"
                }
            }
        }
    },
    "info": {
        "title": "Simple API",
        "version": "0.0.1"
    },
    "paths": {
        "/persons": {
            "get": {
                "responses": {
                    "200": {
                        "description": "A list of Person",
                        "schema": {
                            "$ref": "#/definitions/Persons"
                        }
                    }
                }
            }
        }
    },
    "swagger": "2.0"
}