Her er min DateTimeUtility. Den refererer nogle resourcer som ikke er der, men resten skulle compile:
----
using System;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using B.Common.Properties;
using System.Globalization;
namespace B.Common
{
/// <summary>
/// Contains <see cref="DateTime"/> utility methods.
/// </summary>
public static class DateTimeUtility
{
#region -- Moving holydays --
/// <summary>
/// Gets the carnival sunday
/// </summary>
/// <param name="year">The year.</param>
/// <returns></returns>
public static DateTime GetCarnival(int year)
{
if (year > DateTime.MaxValue.Year)
{
throw new ArgumentException(Resources.DateTimeUtil_InvalidYear, "year");
}
DateTime result = CalculateEasterSunday(year).AddDays(-49);
Debug.Assert(result.DayOfWeek == DayOfWeek.Sunday);
return result;
}
/// <summary>
/// Gets the palm sunday of the specified <paramref name="year"/>.
/// </summary>
/// <param name="year">The year.</param>
/// <returns></returns>
/// <remarks>Sunday before Easter.</remarks>
public static DateTime GetPalmSunday(int year)
{
if (year > DateTime.MaxValue.Year)
{
throw new ArgumentException(Resources.DateTimeUtil_InvalidYear, "year");
}
return CalculateEasterSunday(year).AddDays(-7);
}
/// <summary>
/// Gets the maundy thursday of the specified <paramref name="year"/>.
/// </summary>
/// <param name="year">The year.</param>
/// <returns></returns>
/// <remarks>The Thursday before Easter; commemorates the Last Supper.</remarks>
public static DateTime GetMaundyThursday(int year)
{
if (year > DateTime.MaxValue.Year)
{
throw new ArgumentException(Resources.DateTimeUtil_InvalidYear, "year");
}
return CalculateEasterSunday(year).AddDays(-3);
}
/// <summary>
/// Gets the good friday of the specified <paramref name="year"/>.
/// </summary>
/// <param name="year">The year.</param>
/// <returns></returns>
/// <remarks>Friday before Easter.</remarks>
public static DateTime GetGoodFriday(int year)
{
if (year > DateTime.MaxValue.Year)
{
throw new ArgumentException(Resources.DateTimeUtil_InvalidYear, "year");
}
return GetMaundyThursday(year).AddDays(1);
}
/// <summary>
/// Gets the easter monday of the specified <paramref name="year"/>.
/// </summary>
/// <param name="year">The year.</param>
/// <returns></returns>
/// <remarks></remarks>
public static DateTime GetEasterMonday(int year)
{
if (year > DateTime.MaxValue.Year)
{
throw new ArgumentException(Resources.DateTimeUtil_InvalidYear, "year");
}
return CalculateEasterSunday(year).AddDays(1);
}
/// <summary>
/// Gets the great prayer day of the specified <paramref name="year"/>.
/// </summary>
/// <param name="year">The year.</param>
/// <returns></returns>
/// <remarks>This is a specific danish holyday.</remarks>
public static DateTime GetGreatPrayerDay(int year)
{
if (year > DateTime.MaxValue.Year)
{
throw new ArgumentException(Resources.DateTimeUtil_InvalidYear, "year");
}
//fourth friday after easter.
return CalculateEasterSunday(year).AddDays(5 + 3 * 7);
}
/// <summary>
/// Gets the ascension day of the specified <paramref name="year"/>.
/// </summary>
/// <param name="year">The year.</param>
/// <returns></returns>
/// <remarks>Celebration of the Ascension of Christ into heaven; observed on the 40th day after Easter</remarks>
public static DateTime GetAscensionDay(int year)
{
if (year > DateTime.MaxValue.Year)
{
throw new ArgumentException(Resources.DateTimeUtil_InvalidYear, "year");
}
//sixth thursday after easter.
return CalculateEasterSunday(year).AddDays(39);
}
/// <summary>
/// Gets the whit sunday of the specified <paramref name="year"/>.
/// </summary>
/// <param name="year">The year.</param>
/// <returns></returns>
/// <remarks>Seventh Sunday after Easter; commemorates the emanation of the Holy Spirit to the Apostles; a quarter day in Scotland.</remarks>
public static DateTime GetWhitSunday(int year)
{
if (year > DateTime.MaxValue.Year)
{
throw new ArgumentException(Resources.DateTimeUtil_InvalidYear, "year");
}
return CalculateEasterSunday(year).AddDays(7 * 7);
}
/// <summary>
/// Gets the whit monday of the specified <paramref name="year"/>.
/// </summary>
/// <param name="year">The year.</param>
/// <returns></returns>
/// <remarks>The day after Whitsunday; a legal holiday in England and Wales and Ireland.</remarks>
public static DateTime GetWhitMonday(int year)
{
if (year > DateTime.MaxValue.Year)
{
throw new ArgumentException(Resources.DateTimeUtil_InvalidYear, "year");
}
return GetWhitSunday(year).AddDays(1);
}
/// <summary>
/// Gets ash wednesday.
/// </summary>
/// <param name="year">The year.</param>
/// <returns></returns>
public static DateTime GetAshWednesday(int year)
{
if (year > DateTime.MaxValue.Year)
{
throw new ArgumentException(Resources.DateTimeUtil_InvalidYear, "year");
}
return CalculateEasterSunday(year).AddDays(-46);
}
/// <summary>
/// Calculates easter sunday for the specified <paramref name="year"/>.
/// </summary>
/// <param name="year">The year.</param>
/// <returns>The <see cref="DateTime">date</see> of easter sunday.</returns>
/// <remarks>This method uses the algorithm specified in the wikipedia article: <a href="
http://en.wikipedia.org/wiki/Computus">Computus</a>.</remarks> public static DateTime CalculateEasterSunday(int year)
{
if (year > DateTime.MaxValue.Year)
{
throw new ArgumentException(Resources.DateTimeUtil_InvalidYear, "year");
}
int a = year % 19;
int b = year / 100;
int c = year % 100;
int d = b / 4;
int e = b % 4;
int f = (b + 8) / 25;
int g = (b - f + 1) / 3;
int h = (19 * a + b - d - g + 15) % 30;
int i = c / 4;
int k = c % 4;
int l = (32 + 2 * e + 2 * i - h - k) % 7;
int m = (a + 11 * h + 22 * l) / 451;
int month = (h + l - 7 * m + 114) / 31;
int day = ((h + l - 7 * m + 114) % 31) + 1;
return new DateTime(year, month, day).Date;
}
#endregion
#region -- Weeknumber --
/// <summary>
/// Gets the week number of the specified date.
/// </summary>
/// <param path="year">The year.</param>
/// <param path="month">The month.</param>
/// <param path="day">The day.</param>
/// <returns></returns>
[SuppressMessage("Microsoft.Usage", "CA2233:OperationsShouldNotOverflow")]
public static int WeekNumber(int year, int month, int day)
{
//hrmpf
// System.Globalization.CultureInfo culture = new System.Globalization.CultureInfo("sv-SE", false);
// int week = culture.Calendar.GetWeekOfYear(DateTime.Now, System.Globalization.CalendarWeekRule.FirstFourDayWeek, System.DayOfWeek.Monday);
//
if (year > DateTime.MaxValue.Year)
{
throw new ArgumentException(Resources.DateTimeUtil_InvalidYear, "year");
}
if (month > DateTime.MaxValue.Month)
{
throw new ArgumentException(Resources.DateTimeUtil_InvalidMonth, "month");
}
if (day > DateTime.MaxValue.Day)
{
throw new ArgumentException(Resources.DateTimeUtil_InvalidDay, "day");
}
int a = (14 - month) / 12;
int y = year + 4800 - a;
int m = month + 12 * a - 3;
int JD = day + (153 * m + 2) / 5 + 365 * y + y / 4 - y / 100 + y / 400 - 32045;
int d4 = (((JD + 31741 - JD % 7) % 146097) % 36524) % 1461;
int L = d4 / 1460;
int d1 = ((d4 - L) % 365) + L;
return d1 / 7 + 1;
}
/// <summary>
/// Gets the week number of the specified date.
/// </summary>
/// <param path="date">The date.</param>
/// <returns></returns>
public static int WeekNumber(DateTime date)
{
DateTime dt = date.Date;
return WeekNumber(dt.Year, dt.Month, dt.Day);
}
#endregion
}
}
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