C＃ - 将'days old'转换为出生日期？ [英] C# - convert 'days old' to date of birth?

问题描述

我需要将某人的天数（例如3岁= 1,095天）转换为出生日期回答即dd / MM / yyyy。我已经尝试了很多不同的方法来做到这一点，但无济于事（例如） - 例如使用数学公式，但它有点复杂，特别是考虑如何将其实现到C＃（至少对于初学者）。



以下方框中的内容是我迄今为止尝试过的众多方法之一。我知道这是错的，但这是我的许多尝试之一。什么是最简单的方式（假设1年是365天，如果计算机没有自己的自动计算以包含闰年）？



最后，如果我要包括闰年，那么调整是否只需要考虑1年= 365.25年？或者会有更复杂的事情吗？



亲切的问候。



我有什么试过：

Hi,

I need to convert how many 'days Old' someone is (e.g. 3 years old = 1,095 days old) to a 'date of birth' answer i.e. dd/MM/yyyy. I have tried many different ways how to do this, but to no avail (yet) - e.g. using a mathematical formula but it gets a bit complicated, especially when considering how to implement that into C# (for a beginner, at least).

What is in the box below is one of the many ways I have tried thus far. I know it's wrong but it's one of many of my attempts. What is the simplest way to go about this (assuming 1 year is 365 days, if the computer doesn't have it's own automated calculation to include leap years)?

Finally, if I am to include leap years, would the adjustment to simply be to take into consideration that 1 year = 365.25 years? Or would there be more complexity to this?

Kind regards.

What I have tried:

public static string GetBirthDate(int daysOld)
{
    var dateToday = Convert.ToInt32(DateTime.Now);

    var calc = (dateToday - 365.25 * daysOld);

    return Convert.ToString(calc);
}

推荐答案

如果我这样做，我会这样做：

If I were doing something like this, I would do it like this:

public static DateTime(int days)
{
  return new DateTime.Now.Subtract(TimeSpan.FromDays(days));
}

int daysOld = 1095;
DateTime dob = DateTime.Now.AddDays(daysOld * -1);

public static string GetBirthDate(int daysOld)
{
    // DateTime.Now.AddDays(-daysOld).To... has many format options
    // beware AddDays: daysOld conversion to type double

    return DateTime.Now.AddDays(-daysOld).ToString("dd'/'MM'/'yyyy")
}

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