Xamarin.CommunityToolkit by Microsoft

<PackageReference Include="Xamarin.CommunityToolkit" Version="2.0.0" />

.NET API 749,960 bytes

 TimeSpanToDoubleConverter

public class TimeSpanToDoubleConverter : IValueConverter
Converts a TimeSpan to a Double value expressed in seconds.
public TimeSpanToDoubleConverter()

public object Convert(object value, Type targetType, object parameter, CultureInfo culture)

Converts a TimeSpan to a Double value expressed in seconds.

public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)

Converts a Double (value should be in seconds) to a TimeSpan value.