A TimeZone Aware DateTime Implementation

using System;
using System.Data.SqlTypes;
using Enum=System.Enum;

namespace DateTimeZone
{
	/// <summary>
	/// Convenience class for storing values needed to convey time zone information.
	/// </summary>
	[Serializable]
	public struct DaylightSavingTime : INullable
	{
		public readonly string DayOccurrenceInMonth;
		public readonly int Month;
		public readonly string DayOfWeek;
		public readonly int Hour;
		public readonly int Minutes;
	    private bool isNull;

	    /// <summary>
		/// Default constructor that fully initializes the instance.
		/// </summary>
		/// <param name="occurrence"></param>
		/// <param name="month"></param>
		/// <param name="day"></param>
		/// <param name="hour"></param>
		/// <param name="minutes"></param>
		public DaylightSavingTime(DayOccurrenceInMonth occurrence, int month, DayOfWeek day, int hour, int minutes)
		{
			DayOccurrenceInMonth = Enum.GetName(typeof(DayOccurrenceInMonth), occurrence);
			DayOfWeek = Enum.GetName(typeof(DayOfWeek), day);
			Month = month;
			Hour = hour;
			Minutes = minutes;
	        isNull = false;
		}

        /// <summary>
        /// Returns a nullable instance.
        /// </summary>
	    public static DaylightSavingTime Null
	    {
	        get
	        {
	            DaylightSavingTime dst = new DaylightSavingTime {isNull = true};
	            return dst;
	        }
	    }

		/// <summary>
		/// Convenience method for accessing the stored DayOccurrenceInMonth value as an enum.
		/// </summary>
		/// <returns>The DayOccurrenceInMonth enum value.</returns>
		public DayOccurrenceInMonth GetDayOccurrenceInMonth()
		{
			return (DayOccurrenceInMonth)Enum.Parse(typeof(DayOccurrenceInMonth), DayOccurrenceInMonth);
		}

		/// <summary>
		/// Convenience method for accessing the stored DayOfWeek value as an enum.
		/// </summary>
		/// <returns>The DayOfWeek enum value.</returns>
		public DayOfWeek GetDayOfWeek()
		{
			return (DayOfWeek)Enum.Parse(typeof(DayOfWeek), DayOfWeek);
		}

	    /// <summary>
	    /// Indicates whether a structure is null. This property is read-only.
	    /// </summary>
	    /// <returns>
	    /// <see cref="T:System.Data.SqlTypes.SqlBoolean"></see>true if the value of this object is null. Otherwise, false.
	    /// </returns>
	    public bool IsNull
	    {
            get { return isNull; }
	    }
	}
}