NHSE/NHSE.Core/Structures/Misc/GSaveDate.cs

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;

namespace NHSE.Core;

[StructLayout(LayoutKind.Sequential, Pack = 4)]
[TypeConverter(typeof(ValueTypeTypeConverter))]
public struct GSaveDate
{
    public const int SIZE = 4;
    public override string ToString() => $"{Year:0000}-{Month:00}-{Day:00}";

    public ushort Year { get; set; }
    public byte Month { get; set; }
    public byte Day { get; set; }

    private GSaveDate(int year, int month, int day)
    {
        Year = (ushort) year;
        Month = (byte) month;
        Day = (byte) day;
    }

    public bool IsEmpty => Year == 0 && Month == 0 && Day == 0;

    public static implicit operator GSaveDate(DateTime dt) => dt == DateTime.MinValue ? new GSaveDate() : new GSaveDate(dt.Year, dt.Month, dt.Day);
    public static implicit operator DateTime(GSaveDate dt) => dt.IsEmpty ? DateTime.MinValue : new DateTime(dt.Year, dt.Month, dt.Day);
}