Pikaday is a great little date selector plugin. Whilst the Pikaday Angular plugin makes it easy to integrate into an Angular application, there’s slightly more work involved in getting it working with Angular Formly.
If you haven’t used Formly, it’s essentially a framework for creating forms declaratively; rather than writing out its HTML by hand. It takes care of rendering the relevant controls and their labels, enables you to attach validation and it will inject error messages for you, and a number of other features.
The problem with using Pikaday with Formly is that you’re probably going to want to translate the display value of the plugin into a format more suitable for storage. For example in one form you might display “12 January 2016″ but want it bound to a model in ISO 6031 format.