我尝试实现两个功能:1)将日期转换为儒略日数;2)将儒略日数转换回日期(年、月和日)。我的代码返回的结果是关闭了一天。我不熟悉算法的工作原理,但是如果我使用

Math.Ceiling

朱利安数的工作,但我不确定这是最好的方法来修复代码。任何帮助都将不胜感激。谢谢您。

public class Program

{

///

/// Converts year, month and day to a Julian number

///

///

///

///

///

public static decimal JulianNumber(int year, int month, int day)

{

decimal a, b, c, e, f;

if (month == 1 || month == 2)

{

year -= 1;

month += 12;

}

a = Math.Truncate((decimal) year / 100);

b = Math.Truncate(a / 4);

c = 2 - a + b;

e = Math.Truncate((365.25m * (year + 4716)));

f = Math.Truncate((30.6001m * (month + 1)));

return (c + day + e + f - 1524.5m);

// return Math.Ceiling(c + day + e + f - 1524.5m);

}

///

/// Converts Julian number to year, month and day

///

///

///

public static (int year, int month, int day) GregorianDate(decimal julianNumber)

{

int l, n, i, j, k;

l = (int)julianNumber + 68569;

n = 4 * l / 146097;

l = l - (146097 * n + 3) / 4;

i = 4000 * (l + 1) / 1461001;

l = l - 1461 * i / 4 + 31;

j = 80 * l / 2447;

k = l - 2447 * j / 80;

l = j / 11;

j = j + 2 - 12 * l;

i = 100 * (n - 49) + i + l;

return (i, j, k);

}

public static void Main(string[] args)

{

var (year1, month1, day1) = (2010, 1, 2);

var (year2, month2, day2) = GregorianDate(JulianNumber(year1, month1, day1));

Console.WriteLine(year1 == year2); // True

Console.WriteLine(month1 == month2); // True

Console.WriteLine(day1 == day2); // False!

}

}