Add validation for input with format

[andreyjkee]

When format, for example, is M/D/YY, I can input value like 8/18/18qwerty, and there are no form validation errors, but in $ngModelValue we have undefined. I think we should provide the error in form.$error object when invalid format takes place.

[hexadecy]

Which $error type to set? 'date-format' ?

ngModel.$setValidity('date-format', moment(value, scope.format).isValid());

[andreyjkee]

yes, I think date-format or simply format word will be fine, like min/max errors

at this moment I have workaround in my code where I use format keyword for $errors
this.form.date.$setValidity("format", moment(this.form.date.$viewValue, scope.format).isValid());

[andreyjkee]

And additional note moment('4/30/19dd', 'M/D/YY').isValid() for example, returns true. I think it is wrong, we need to make moment use strict parsing, moment('4/30/19dd', 'M/D/YY', true).isValid()

[hexadecy]

I think strict parsing is a good idea in this case.

[andreyjkee]

@hexadecy Works for now, thank you.
Waiting for npm release :)