Umbraco Forms comes with a number of Field Types to allow you to request certain data in the forms that you design & build. This documentation is to guide specific details about field types that we ship that require some detail in how they work.
To achieve this a new Razor partial view is included /Views/Partials/Forms/DatePicker.cshtml. Once on a page with a form that includes a Date Picker, this includes the MomentJS library to help with the date locale formatting & the appropriate changes to Pikaday.js to support the locales. If you wish to use a different DatePicker component this is the file that you would customize to your needs.
Date Picker configuration of the year range
The DatePicker has one configuration setting to control the number of year shown. The default is 10 years which makes the picker unusable for picking birth dates.
Go to ~/App_Data/UmbracoForms/umbracoforms.config and update <setting key="DatePickerYearRange" value="10" /> to a higher number (e.g. 100)