[datepicker] time is reset to midnight when field is blurred

Bug

Create a mat-datepicker, with MatMomentDateModule adapter and with this provider

  providers: [{
    provide: MAT_DATE_FORMATS,
    useValue: {
      parse: {
        dateInput: 'L LTS',
      },
      display: {
        dateInput: 'L LTS',
        monthYearLabel: 'MMM YYYY',
        dateA11yLabel: 'L LTS',
        monthYearA11yLabel: 'MMMM YYYY',
      },
    }
  }]

Select a date

The input display 05/28/2018 12:00:00 AM

Edit the time

What is the expected behavior?

The date should change the time

What is the current behavior?

The time is reset to 12:00:00 AM when user blur the field

What are the steps to reproduce?

StackBlitz doesn’t work with moment, this is another issue (#9780). But for reference : https://stackblitz.com/edit/angular-material2-issue-25p4rg

What is the use-case or motivation for changing an existing behavior?

It use to work before a62cdb6

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Chrome Version 66.0.3359.181 moment 2.22.1

Angular CLI: 6.0.5
Node: 8.11.1
OS: darwin x64
Angular: 6.0.3
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                            Version
------------------------------------------------------------
@angular-devkit/architect          0.6.0
@angular-devkit/build-angular      0.6.0
@angular-devkit/build-optimizer    0.6.0
@angular-devkit/core               0.6.0
@angular-devkit/schematics         0.6.5
@angular/cdk                       6.1.0
@angular/cli                       6.0.5
@angular/material                  6.1.0
@angular/material-moment-adapter   6.1.0
@ngtools/webpack                   6.0.0
@schematics/angular                0.6.5
@schematics/update                 0.6.5
rxjs                               6.2.0
typescript                         2.7.2
webpack                            4.6.0

[tchandelle]

Thanks. I confirm that extending MomentDateAdapter with the method below solve the issue

compareDate(first: Moment, second: Moment): number {
   return first.valueOf() - second.valueOf();
 }

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