C# DateTime DayOfYear

Description

DateTime DayOfYear gets the day of the year represented by this instance.

Syntax

DateTime.DayOfYear has the following syntax.


public int DayOfYear { get; }

Example

The following example displays the day of the year of December 31 for the years 2010-2020 in the Gregorian calendar.


//from  w  ww  .  j  a  va  2  s .c  o  m
using System;

public class Example
{
   public static void Main()
   {
      DateTime dec31 = new DateTime(2010, 12, 31);
      for (int ctr = 0; ctr <= 10; ctr++) {
         DateTime dateToDisplay = dec31.AddYears(ctr);
         Console.WriteLine("{0:d}: day {1} of {2} {3}", dateToDisplay, 
                           dateToDisplay.DayOfYear,
                           dateToDisplay.Year,   
                           DateTime.IsLeapYear(dateToDisplay.Year) ? 
                                               "(Leap Year)" : ""); 
      }  

   }
}

Note that the example shows that December 31 is the 366th day of the year in leap years.

The code above generates the following result.