ng-bootstrap Datepicker uses the minDate n maxDate validation input, and it expects the input to be the same model format it generates... long story short, when using minDate for example on input with ngbDatepicker it throw an error because both the ngb component and your module uses the same validation but expects a different format
this is the component i used
https://ng-bootstrap.github.io/#/components/datepicker
ng-bootstrap Datepicker uses the minDate n maxDate validation input, and it expects the input to be the same model format it generates... long story short, when using minDate for example on input with ngbDatepicker it throw an error because both the ngb component and your module uses the same validation but expects a different format this is the component i used https://ng-bootstrap.github.io/#/components/datepicker