Billing/Billing.Shared/UI/Converters.cs

using Billing.Languages;
using System;
using System.Globalization;
using Xamarin.Forms;

namespace Billing.UI
{
    public class TitleDateConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is DateTime date)
            {
                return date.ToString(Resource.TitleDateFormat);
            }
            return value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return value;
        }
    }

    public class MoneyConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is decimal d)
            {
                return "¥ " + d.ToString("n2", CultureInfo.InvariantCulture);
            }
            return value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return value;
        }
    }
}