First Day Of Year - CSharp System

CSharp examples for System:DateTime Year

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Description

First Day Of Year

Demo Code


using System.Text;
using System.Linq;
using System.Collections.Generic;
using System;//from  w w w . j a  v a 2  s  . co m

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

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