Last Day Of Year - CSharp System

Description

Last Day Of Year

Demo Code

using System.Text;
using System.Linq;
using System.Collections.Generic;
using System;//www  .jav a2s  .c om

public class Main{
        public static DateTime LastDayOfYear(this DateTime dt, DayOfWeek dow)
        {
            return dt.LastDayOfYear().PreviousDay(dow, true);
        }
        public static DateTime LastDayOfYear(this DateTime dt)
        {
            return dt.FirstDayOfYear().AddYears(1).AddDays(-1);
        }
        public static DateTime PreviousDay(this DateTime dt, DayOfWeek dow, bool includeThis)
        {
            int diff = dt.DayOfWeek - dow;
            if ((includeThis && diff < 0) || (!includeThis && diff <= 0)) diff += 7;
            return dt.Date.AddDays(-diff);
        }
        public static DateTime PreviousDay(this DateTime dt, DayOfWeek dow)
        {
            return dt.PreviousDay(dow, false);
        }
        public static DateTime PreviousDay(this DateTime dt)
        {
            return dt.Date.AddDays(-1);
        }
        public static DateTime FirstDayOfYear(this DateTime dt, DayOfWeek dow)
        {
            return dt.FirstDayOfYear().NextDay(dow, true);
        }
        public static DateTime FirstDayOfYear(this DateTime dt)
        {
            return new DateTime(dt.Year, 1, 1);
        }
}

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