DiscordChatExporter/DiscordChatExporter.Gui/Converters/DateTimeOffsetToDateTimeConverter.cs

using System;
using System.Globalization;
using System.Windows.Data;

namespace DiscordChatExporter.Gui.Converters
{
    [ValueConversion(typeof(DateTimeOffset?), typeof(DateTime?))]
    public class DateTimeOffsetToDateTimeConverter : IValueConverter
    {
        public static DateTimeOffsetToDateTimeConverter Instance { get; } = new DateTimeOffsetToDateTimeConverter();

        public object? Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is DateTimeOffset dateTimeOffsetValue)
                return dateTimeOffsetValue.DateTime;

            return default(DateTime?);
        }

        public object? ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is DateTime dateTimeValue)
                return new DateTimeOffset(dateTimeValue);

            return default(DateTimeOffset?);
        }
    }
}