( on admin interface )
1 - create a content type
  - Attribute 1 - Type: "ezstring"
  - Attribute 1 - Name: "Name"
  - Attribute 1 - Identifier: "name"
  - Attribute 2 - Type: "ezdatetime"
  - Attribute 2 - Name: "DateTime"
  - Attribute 2 - Identifier: "datetime"

( on a REST client )
1 - Send request:
POST /api/ezp/v2/content/objects
Accept: application/vnd.ez.api.Content+json
Authentication: ( log as admin )
Content-Type: application/vnd.ez.api.ContentCreate+xml
Body: ( XML bellow )
2 - Verify that on the response the current value of field DateTime is "0"
    ( response is also bellow )

<ContentCreate xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <ContentType href="/api/ezp/v2/content/types/48"/>
  <mainLanguageCode>eng-GB</mainLanguageCode>
  <LocationCreate>
    <ParentLocation href="/api/ezp/v2/content/locations/1/2" />
    <priority>0</priority>
    <hidden>false</hidden>
    <sortField>PATH</sortField>
    <sortOrder>ASC</sortOrder>
  </LocationCreate>
  <Section href="/api/ezp/v2/content/sections/1"/>
  <alwaysAvailable>true</alwaysAvailable>
  <fields>
    <field>
      <fieldDefinitionIdentifier>name</fieldDefinitionIdentifier>
      <languageCode>eng-GB</languageCode>
      <fieldValue>Test</fieldValue>
    </field>
    <field>
      <fieldDefinitionIdentifier>datetime</fieldDefinitionIdentifier>
      <fieldValue>1376910190</fieldValue>
    </field>
  </fields>
</ContentCreate>

    {
       "Content":
       {
           "_media-type": "application/vnd.ez.api.Content+json",
           "_href": "/api/ezp/v2/content/objects/62",
           "_remoteId": "827490b145a386234493eed3180c7880",
           "_id": "62",
           "ContentType":
           {
               "_media-type": "application/vnd.ez.api.ContentType+json",
               "_href": "/api/ezp/v2/content/types/48"
           },
           "Name": "Test",
           "Versions":
           {
               "_media-type": "application/vnd.ez.api.VersionList+json",
               "_href": "/api/ezp/v2/content/objects/62/versions"
           },
           "CurrentVersion":
           {
               "_media-type": "application/vnd.ez.api.Version+json",
               "_href": "/api/ezp/v2/content/objects/62/currentversion",
               "Version":
               {
                   "_media-type": "application/vnd.ez.api.Version+json",
                   "_href": "/api/ezp/v2/content/objects/62/versions/1",
                   "VersionInfo":
                   {
                       "id": "511",
                       "versionNo": 1,
                       "status": "DRAFT",
                       "modificationDate": "2013-08-19T12:46:06+02:00",
                       "Creator":
                       {
                           "_media-type": "application/vnd.ez.api.User+json",
                           "_href": "/api/ezp/v2/user/users/14"
                       },
                       "creationDate": "2013-08-19T12:46:06+02:00",
                       "initialLanguageCode": "eng-GB",
                       "languageCodes": "eng-GB",
                       "names":
                       {
                           "value":
                           [
                               {
                                   "_languageCode": "eng-GB",
                                   "#text": "Test"
                               }
                           ]
                       },
                       "Content":
                       {
                           "_media-type": "application/vnd.ez.api.ContentInfo+json",
                           "_href": "/api/ezp/v2/content/objects/62"
                       }
                   },
                   "Fields":
                   {
                       "field":
                       [
                           {
                               "id": "233",
                               "fieldDefinitionIdentifier": "name",
                               "languageCode": "eng-GB",
                               "fieldValue": "Test"
                           },
                           {
                               "id": "234",
                               "fieldDefinitionIdentifier": "datetime",
                               "languageCode": "eng-GB",
                               "fieldValue":
                               {
                                   "timestamp": 0,
                                   "rfc850": "Thursday, 01-Jan-70 00:00:00 GMT+0000"
                               }
                           }
                       ]
                   },
                   "Relations":
                   {
                       "_media-type": "application/vnd.ez.api.RelationList+json",
                       "_href": "/api/ezp/v2/content/objects/62/versions/1/relations",
                       "Relation":
                       [
                       ]
                   }
               }
           },
           "Section":
           {
               "_media-type": "application/vnd.ez.api.Section+json",
               "_href": "/api/ezp/v2/content/sections/1"
           },
           "Locations":
           {
               "_media-type": "application/vnd.ez.api.LocationList+json",
               "_href": "/api/ezp/v2/content/objects/62/locations"
           },
           "Owner":
           {
               "_media-type": "application/vnd.ez.api.User+json",
               "_href": "/api/ezp/v2/user/users/14"
           },
           "mainLanguageCode": "eng-GB",
           "alwaysAvailable": "true"
       }
    }