SimulationServerYL/Models/SimulationCommon/DataCalculate.cs

using System;

static class DataCalculate
{
    static void Main()
    {
        Console.Write("请输入年份：");
        int year = int.Parse(Console.ReadLine());
        Console.Write("请输入月份：");
        int month = int.Parse(Console.ReadLine());
        Console.Write("请输入日期：");
        int day = int.Parse(Console.ReadLine());

        int daysInYear = GetDaysInYear(year, month, day);
        Console.WriteLine($"{year}年{month}月{day}日是该年的第{daysInYear}天。");
    }

    public static int GetDaysInYear(int year, int month, int day)
    {
        int[] daysInMonths = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
        if (IsLeapYear(year))
        {
            daysInMonths[1] = 29;
        }
        int days = day;
        for (int i = 0; i < month - 1; i++)
        {
            days += daysInMonths[i];
        }
        return days;
    }

    public static bool IsLeapYear(int year)
    {
        return (year % 4 == 0 && year % 100!= 0) || (year % 400 == 0);
    }
}