[V4-beta.7] ion-datetime not bind as ISO-8601 format

Bug Report

Ionic Info

Ionic:

   ionic (Ionic CLI)          : 4.1.1 (/Users/joeldaros/.nvm/versions/node/v8.11.3/lib/node_modules/ionic)
   Ionic Framework            : @ionic/angular 4.0.0-beta.7
   @angular-devkit/core       : 0.7.5
   @angular-devkit/schematics : 0.7.5
   @angular/cli               : 6.1.5
   @ionic/ng-toolkit          : 1.0.7
   @ionic/schematics-angular  : 1.0.5

Cordova:

   cordova (Cordova CLI) : 8.0.0
   Cordova Platforms     : ios 4.5.5
   Cordova Plugins       : cordova-plugin-ionic-keyboard 2.1.2, cordova-plugin-ionic-webview 2.0.2, (and 7 other plugins)

System:

   ios-deploy : 2.0.0
   NodeJS     : v8.11.3 (/Users/joeldaros/.nvm/versions/node/v8.11.3/bin/node)
   npm        : 6.4.0
   OS         : macOS High Sierra
   Xcode      : Xcode 9.4 Build version 9F1027a

Describe the Bug The ion-datetime component do not bind his value to a ISO-8601 format when changed. It binds the date to a object:

{
  "dateBk": {
    "day": { "text": "21", "value": 21, "columnIndex": 0 },
    "month": { "text": "Aug", "value": 8, "columnIndex": 1 },
    "year": { "text": "2017", "value": 2017, "columnIndex": 2 }
  }
}

Example: The initial date (ISO-8601) of component is correct:

When you pick another date from the component it binds to a object instead of a string in 8601 format like described in documentation:

Steps to Reproduce Steps to reproduce the behavior:

1. Change the date from the ion-datetime component
2. Check the results.

Related Code

https://github.com/MrSparklle/Inc4

[Chethannp]

Any idea on when this will be fixed?

[MrSparklle]

This issue has been fixed in https://github.com/ionic-team/ionic/pull/15833 and https://github.com/ionic-team/ionic/pull/15907 released in (Beta-13).