datepicker: startAt and setting value doesn't work correctly

repro (using mmalerba:dp-a11y):

• predefine value to 2017-05-02 (YYYY-MM-DD), input shows correctly 02/05/2017
• open datepicker, it opens on a wrong month (second, instead of the fifth)
• select 6th day of the second month (that was open), input changes to 06/02/2017 (should have been 06/05/2017)
• close and open input again, selected day is set to second of february, but calendar opens at sixth month

@mmalerba

[mzernetsch]

Found a simple workaround that works for my use-case. I set the startAt property to the date i provide as ngModel. Now (using german locale) the datepicker will open at the correct month.

  <md-input-container>
    <input mdInput [mdDatepicker]="picker" placeholder="Choose a date" [(ngModel)]="date">
      <button mdSuffix [mdDatepickerToggle]="picker"></button>
    </md-input-container>
  <md-datepicker #picker [startAt]="date"></md-datepicker>

[emreavsar]

I cannot understand how you guys from material are not providing at least one MomentDateAdapter, so that everyone can use a basic version of i18nalized date-pickers. I know there are ways to implement it, but only supporting MM-DD-YYYY out of the box is not enough.