Date Only Converters for EF.

DateOnlyConverters.cs

using Microsoft.EntityFrameworkCore.ChangeTracking;
using Microsoft.EntityFrameworkCore.Storage.ValueConversion;

namespace MyProject.Data
{

    /// <summary>
    /// Converts <see cref="DateOnly" /> to <see cref="DateTime"/> and vice versa.
    /// </summary>
    public class DateOnlyConverter : ValueConverter<DateOnly, DateTime>
    {
        /// <summary>
        /// Creates a new instance of this converter.
        /// </summary>
        public DateOnlyConverter() : base(
                d => d.ToDateTime(TimeOnly.MinValue),
                d => DateOnly.FromDateTime(d))
        { }
    }

    /// <summary>
    /// Converts <see cref="DateOnly?" /> to <see cref="DateTime?"/> and vice versa.
    /// </summary>
    public class NullableDateOnlyConverter : ValueConverter<DateOnly?, DateTime?>
    {
        /// <summary>
        /// Creates a new instance of this converter.
        /// </summary>
        public NullableDateOnlyConverter() : base(
            d => d == null
                ? null
                : new DateTime?(d.Value.ToDateTime(TimeOnly.MinValue)),
            d => d == null
                ? null
                : new DateOnly?(DateOnly.FromDateTime(d.Value)))
        { }
    }
}