C# 如何将两个或多个整数转换为日期？

Question

如何将两个整数(例如 28 和 03)转换为类似“28.03”的日期。整数应由用户输入，然后转换为日期。另外，如何在日期中添加天数？

Answer 1

只是您示例的一个实现:

public static string GetDateString(int month, int day)
{
    return new DateTime(DateTime.Now.Year, month, day).ToString("dd.MM");
}

要在日期中添加天数，您可以使用 DateTime.AddDays() 方法:

DateTime date = DateTime.Now;
DateTime otherDate = date.AddDays(7);

@Giorgi 和@D 提到的链接。彼得罗夫也非常有用。

更新:

这是一个基于您的评论的示例。

class ConsoleApp
{
    public void Main(string[] args)
    {
        int day = int.Parse(Console.ReadLine());
        int month = int.Parse(Console.ReadLine());

        string formattedDate = GetDateString(month, day);

        Console.WriteLine(formattedDate);

        // You cannot initialize a DateTime struct only with month and day.
        // Because Year is not relevant we use the current year.
        DateTime date = new DateTime(DateTime.Now.Year, month, day);
        DateTime otherDate = date.AddDays(5);

        Console.WriteLine(GetFormattedDate(otherDate));
    }

    public static string GetFormattedDate(DateTime date)
    {
        // The ToString() method accepts any custom date format string.
        // Here is how you can create a custom date format string:
        // https://msdn.microsoft.com/en-us/library/8kb3ddd4%28v=vs.110%29.aspx

        // dd: days in two digits
        // MM: months in two digits
        return date.ToString("dd.MM");
    }

    public static string GetDateString(int month, int day)
    {
        // Here we construct a DateTime struct
        DateTime date = new DateTime(DateTime.Now.Year, month, day);

        // Now we extract only the day and month parts.
        return GetFormattedDate(date);
    }
}