This is a paid asset, but now you can download Date Picker Pro – Calendar for Unity for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Date Picker Pro – Calendar for Unity v1.2.1
A professional date picker for unity UI. It is Simple to use and can be customized completely with your own colors , materials , fonts and layouts. All latest unity versions are supported. Supports TextMeshPro
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Online Demo
Online Documentation
● Full source code included
● 3 Selection modes : single date , date range, multiple date
● Editor preview
● 8 Ready made designs
● Size Adjustable
● Use UI.Text or TextMeshPro interchangeably.
● Supports both standard and popup date picker
● Appearance is completely customizable. You can use your own colors , sprites , background images , layouts and fonts. You can create virtually any layout you want.
● Full control over date formats using standard C# conventions