以年、日、小时、秒计的独立计算闰年的时间

Question

我目前正在做一个我已经达到要求的学校项目，但我想挑战自己。如何根据今天的date/time?

以下列格式准确显示我的年龄

年龄：27 岁 - 或 - 天 - 或 - 时 - 或 - 秒（考虑闰年）

我所做的研究：How would you calculate the age in C# using date of birth (considering leap years)

我更想寻找它背后的数学原理。这是我目前使用的数学，但它只精确到 16 小时或 960 分钟或 57,600 秒。

// Tried using "double" datatype, still same problem.
int years = DateTime.Now.Year - dateBirthDate.Year;
int days = (years / 4) + (years * 365);
int hours = (days * 24) + DateTime.Now.Hour;
int minutes = hours * 60;
int seconds = (minutes * 60) + ((DateTime.Now.Hour * 60) * 60) + DateTime.Now.Second;

应该显示接近 0。

输出：

Thank you Mat, what is your date of birth? Feel free to include the time you were born. 09/08/2018 5:11pm
Years   :0
Days    :0
Minutes :1020
Seconds :122425

#更新 #1

我已经设法使代码部分工作，但发现了另一个无法预料的问题。现在它不会考虑尚未到来的生日。想法？

//Needed casting so I could remove the decimals.
TimeSpan span = DateTime.Now.Subtract(dateBirthDate);
int years = (int)span.Days/365;
int months = years * 12;
int days = (int)span.TotalDays;
int hours = (int)span.TotalHours;
int minutes = (int)span.TotalMinutes;
int seconds = (int)span.TotalSeconds;

Answer 1

不稳定的解决方法

必须将 TimeSpan 转换为 int 以删除小数。为了获取 TimeSpan 年份，我简单地用月份除以 365，然后将其转换为 (int)，以便它只显示整数。然后我创建了一个 if/else 条件和一个嵌套的条件来调整当前正在发生或尚未到来的生日。逻辑似乎合理。

        //Needed casting so I could remove the decimals.
        TimeSpan span = DateTime.Now.Subtract(dateBirthDate);

        //Creating workable if/else to account for birthday's yet to come.
        int dateCorrectorMonthNow = DateTime.Now.Month;
        int dateCorrectorDayNow = DateTime.Now.Day;
        int dateCorrectorMonthThen = dateBirthDate.Month;
        int dateCorrectorDayThen = dateBirthDate.Day;


        int years = (int)span.Days/365;
        int months = years * 12;
        int days = (int)span.TotalDays;
        int hours = (int)span.TotalHours;
        int minutes = (int)span.TotalMinutes;
        int seconds = (int)span.TotalSeconds;

        if (dateCorrectorMonthNow <= dateCorrectorMonthThen)
        {
            if (dateCorrectorDayNow  <= dateCorrectorDayThen)
            {
                Console.WriteLine($"Years   :{years}");
            }
            else
            {
                Console.WriteLine($"Years   :{years-1}");
            }
        }
        else
        {
            Console.WriteLine($"Years   :{years}");
        }

以年、日、小时、秒计的独立计算闰年的时间

Time alive in Years, Days, Hours, Seconds Independently Accounting for Leap Year

c#

logic

datetime

timespan

#更新 #1

不稳定的解决方法