How to set date and time mask in Xamarin.Forms Masked Entry control
This article explains how to set Mask as date and time using the Syncfusion Xamarin.Forms SfMaskedEdit with the following steps:
Step 1: Create a SfMaskedEdit control with all the necessary assemblies.
Refer to this Getting started documentation, to create a simple SfMaskedEdit and configure it.
Step 2: By using the Mask property of the SfMaskedEdit, you can mask the input. Please refer to the following code sample, to initialize the SfMaskedEdit control with Mask and Watermark properties.
[XAML]
<maskededit:SfMaskedEdit Mask="00/00/0000 00:00:00" Watermark="MM/dd/yyyy HH:mm:ss" />
Output

See also
What are mask types in SfMaskedEdit
How to hide the prompt character