Days In Year - CSharp System

CSharp examples for System:DateTime Year

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Description

Days In Year

Demo Code


using System.Text;
using System.Linq;
using System.Collections.Generic;
using System;/*from   w w w. j  av a  2s  .  c om*/

public class Main{
        public static int DaysInYear(this DateTime dt, DayOfWeek dow)
        {
            return (dt.LastDayOfYear(dow).DayOfYear - dt.FirstDayOfYear(dow).DayOfYear) / 7 + 1;
        }
        public static int DaysInYear(this DateTime dt)
        {
            return (dt.LastDayOfYear() - dt.FirstDayOfYear()).Days + 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);
        }
        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);
        }
}

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