Question

可能重复：
Calculating age from birthday

如何以dd/MM/yyyy

格式从TextBox获取输入，如何计算年龄？

e.g。

输入：txtDOB.Text 20/02/1989（字符串格式）
输出：txtAge.Text 23

Answer 1

您可以使用Substract（link）的DateTime方法，然后使用Days属性来确定实际年龄：

DateTime now = DateTime.Now;
DateTime givenDate = DateTime.Parse(input);

int days = now.Subtract(givenDate).Days
int age = Math.Floor(days / 365.24219)

Answer 2

正如评论中已经提到的，正确的答案在这里：Calculate age in C#

你只需要将生日作为日期时间：

DateTime bday = DateTime.ParseExact("20/02/1989", "dd/MM/yyyy", CultureInfo.InvariantCulture);

Answer 3

TimeSpan TS = DateTime.Now - new DateTime(1989, 02, 20);
double Years = TS.TotalDays / 365.25;  // 365 1/4 days per year

Answer 4

将您的出生日期解析为DateTime后，以下内容将起作用：

static int AgeInYears(DateTime birthday, DateTime today)
{
    return ((today.Year - birthday.Year) * 372 + (today.Month - birthday.Month) * 31 + (today.Day - birthday.Day)) / 372;
}

解析日期如下：

DateTime dob = DateTime.ParseExact("20/02/1989", "dd/MM/yyyy", CultureInfo.InvariantCulture);

示例程序：

using System;

namespace Demo
{
    class Program
    {
        static void Main(string[] args)
        {
            DateTime dob = new DateTime(2010, 12, 30);
            DateTime today = DateTime.Now;

            int age = AgeInYears(dob, today);

            Console.WriteLine(age); // Prints "1"
        }

        static int AgeInYears(DateTime birthday, DateTime today)
        {
            return ((today.Year - birthday.Year) * 372 + (today.Month - birthday.Month) * 31 + (today.Day - birthday.Day)) / 372;
        }
    }
}

Answer 5

这个答案不是最有效的，因为它使用循环，但它不依赖于使用365.25幻数。

将整个年数从datetime返回到今天的函数：

public static int CalcYears(DateTime fromDate)
    {
        int years = 0;
        DateTime toDate = DateTime.Now;
        while (toDate.AddYears(-1) >= fromDate)
        {
            years++;
            toDate = toDate.AddYears(-1);
        }
        return years;
    }

用法：

int age = CalcYears(DateTime.ParseExact(txtDateOfBirth.Text, "dd/MM/yyyy", CultureInfo.InvariantCulture));

Answer 6

var date = DateTime.ParseExact("20/02/1989", "dd/MM/yyyy", System.Globalization.CultureInfo.InvariantCulture);
var age = (DateTime.Today.Year - date.Year);
Console.WriteLine(age);

Answer 7

试试这个

string[] AgeVal=textbox.text.split('/');
string Year=AgeVal[2].tostring();
string CurrentYear= DateTime.Now.Date.Year.ToString();
int Age=Convert.ToInt16((Current))-Convert.ToInt16((Year));

减去这两个值并获得你的年龄。

从C＃中的文本框中的日期计算年龄

7 个答案: