Namespace: XPlat.ApplicationModel
Provides information about a package.
public interface IPackage3
Supported platforms
Platform
Version
.NET Standard
1.4
Xamarin.Android
8.1
Xamarin.iOS
1.0
UWP
10.0
Properties
InstalledDate
Gets the date on which the application package was installed or last updated.
DateTimeOffset InstalledDate { get; }
Related information
References
​Package - Microsoft Docs​

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Platform	Version
.NET Standard	1.4
Xamarin.Android	8.1
Xamarin.iOS	1.0
UWP	10.0