C# .NET - julian date

1. for conversion from US/Uk format to Julian Format

 

public static long ConvertToJulian( DateTime dt)

    {

      int m = dt.Month;

      int d = dt.Day;

      int y = dt.Year;

 

        if(m < 3)

        {

            m = m + 12;

             y=y-1 ;

        }

        long jd = d + (153 * m - 457) / 5 + 365 * y + (y / 4) - (y / 100) + (y / 400) + 1721119;

        return jd;

    }

2. for conversion from Julian format to  US/Uk Format 

public static DateTime ConvertFromJulian(int m_JulianDate)

    {

 

      long L = m_JulianDate + 68569;

      long N = (long) ((4*L)/146097) ;

      L = L - ((long)((146097 * N + 3)/4) );

      long I = (long) ((4000 *(L + 1)/1461001)) ;

      L = L - (long)((1461*I)/4) + 31;

      long J = (long)((80*L)/2447);

      int Day = (int)(L - (long)((2447*J)/80));

      L=(long)(J/11) ;

      int Month = (int)(J + 2 - 12*L);

      int Year = (int)(100*(N-49) + I + L) ;

 

      DateTime dt = new DateTime(Year,Month,Day);

      return dt;

    }

this will solve you problem.......and hope you know how to pass parameter.....

Reference : http://www.nullskull.com/q/10284522/julian-dateurgent.aspx