DateTimeToStringConverter.cs

using System;
using System.Globalization;
using Microsoft.Maui.Controls;
 
namespace NeuroAccessMaui.UI.Converters
{
    public class DateTimeToStringConverter : IValueConverter
    {
        public object Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
        {
            if (value is not DateTime DateTime)
                return string.Empty;
 
            bool ForceUtc = IsForceUtc(parameter);
 
            DateTime Formatted = ForceUtc ? DateTime.ToUniversalTime() : DateTime;
            bool DateOnly = IsDateOnly(Formatted);
 
            string Result = DateOnly
                ? Formatted.ToString("d", culture)
                : Formatted.ToString("G", culture);
 
            if (Formatted.Kind == DateTimeKind.Utc || ForceUtc)
                Result = $"{Result} (UTC)";
 
            return Result;
        }
 
        public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
        {
            if (value is string s && DateTime.TryParse(s, culture, DateTimeStyles.None, out DateTime Parsed))
                return Parsed;
 
            return DateTime.MinValue;
        }
 
        private static bool IsDateOnly(DateTime dateTime)
        {
            return dateTime.TimeOfDay == TimeSpan.Zero;
        }
 
        private static bool IsForceUtc(object? parameter)
        {
            if (parameter is null)
                return false;
 
            if (parameter is bool BoolParam)
                return BoolParam;
 
            if (parameter is string StrParam)
                return string.Equals(StrParam, "utc", StringComparison.OrdinalIgnoreCase);
 
            return false;
        }
    }
}