When Managing Forms in Ionic Applications, Angular-Formly is a great tool, this is a simple example of a custom template using the DatePicker Plugin
Blog Post - Ionic Framework Custom Formly Template using DatePicker Plugin
YouTube Video - Part Two - https://www.youtube.com/watch?v=KI-h-9Tyco8
YouTube Video - Part One - https://www.youtube.com/watch?v=iM_KjhY4lL0