Top 20 NuGet date-picker Packages

A styleable DatePicker for Android using the old spinner style (NumberPickers)
An infinite scrolling timeline to pick a date for Android
You can now select a date and a time with only one widget
Fully customizable calendar for Xamarin.Android with a wide variety of features and displaying modes.
Xamarin.Android library for Date and Time Picker in same dialog
A calendar that allows you to select both a single date and a period. It Allows you to change colors programmatically without reference to the theme.
A Material design back port of Android's CalendarView
Fancy year and month picker library for Xamarin.Android
Xamarin Binding Library - FSCalendar
An Android Library to pick dates range, that helps user to select range from future dates.