A TimeZone Aware DateTime Implementation

using System;

namespace DateTimeZone
{
	/// <summary>
	/// Various time constants stored here. Should consider moving this to
	/// the same namespace as DateUtil (Viz.Core.Util).
	/// </summary>
    public static class TimeConstants
    {
		/// <summary>Number of days in a year.</summary>
        public const int DAYS_IN_YEAR = 365;

		/// <summary>Number of days in a week.</summary>
        public const int DAYS_IN_WEEK = 7;

		/// <summary>Number of days in a week end.</summary>
		public const int DAYS_IN_WEEK_END = 2;

		/// <summary>Number of days in a work week.</summary>
		public const int DAYS_IN_WORK_WEEK = 5;

		/// <summary>The first day in a month is always day 1.</summary>
		public const int FIRST_DAY_IN_MONTH = 1;

		/// <summary>Number of hours in a day.</summary>
        public const int HOURS_IN_DAY = 24;

		/// <summary>Number of hours in a week.</summary>
        public const int HOURS_IN_WEEK = 168;

		/// <summary>Number of months in a year.</summary>
		public const int MONTHS_IN_YEAR = 12;

		/// <summary>Number of months in a half year.</summary>
		public const int MONTHS_IN_HALF_YEAR = 6;

		/// <summary>Number of months in a season.</summary>
		public const int MONTHS_IN_SEASON = 6;

		/// <summary>Constant defining the end day of a week</summary>
		public const VizWeek END_OF_WEEK = VizWeek.Sunday;

		/// <summary>Constant defining the start day of a week</summary>
		public const VizWeek START_OF_ISO_WEEK = VizWeek.Monday;

		/// <summary>Constant defining the first day in a week end</summary>
		public const VizWeek FIRST_DAY_IN_WEEK_END = VizWeek.Saturday;

		/// <summary>Constant defining the last day in a week end</summary>
		public const VizWeek LAST_DAY_IN_WEEK_END = VizWeek.Saturday;


		/// <summary>Min date.</summary>
		public static readonly DateTime MIN_DATE = new DateTime(1753, 1, 1);
		
		/// <summary>Min date.</summary>
		/// <remarks>
		/// Must set it to the second day as a time shift to another time zone might tip it to day one.
		/// And if 1st of January is used it might tip the year back to 1752 which in turn will make the
		/// SQL-server fail on persisting the date.
		/// </remarks>
		public static readonly UtcDateTime MIN_UTC_DATE = new UtcDateTime(1753, 1, 2);

		/// <summary>Max date in UTC.</summary>
		public static readonly UtcDateTime MAX_UTC_DATE = new UtcDateTime(DateTime.MaxValue);

		public static readonly LocalDateTime MAX_LDT_UTC_DATE = MAX_UTC_DATE.AddDaysToUtcDateTime(-1).AsLocalDateTime();

		/// <summary>Time span for one day.</summary>
		public static readonly TimeSpan ONE_DAY_TIME_SPAN = new TimeSpan(1, 0, 0, 0);

		/// <summary>Time span for one second.</summary>
		public static readonly TimeSpan ONE_SECOND_TIME_SPAN = new TimeSpan(0, 0, 0, 1);

		public static readonly string[] MONTH_NAMES = new string[] { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };
		public static readonly string[] MONTH_SHORT_NAMES = new string[] { "JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", "SEP", "OCT", "NOV", "DEC" };
		public static readonly string[] WEEK_DAY_NAMES = new string[] { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" };

    }
}