using System;
using System.Collections.Generic;
using System.Text;
 
namespace PublicClass
{
  public static class CalculationDate
  {
    /// <summary>
    /// 由兩個(gè)日期計(jì)算出年齡(歲、月、天)
    /// </summary>
    public static void calculationDate(DateTime beginDateTime, DateTime endDateTime)
    {
      if (beginDateTime > endDateTime)
        throw new Exception("開始時(shí)間應(yīng)小于或等與結(jié)束時(shí)間！");
 
      /*計(jì)算出生日期到當(dāng)前日期總月數(shù)*/
      int Months = endDateTime.Month - beginDateTime.Month + 12 * (endDateTime.Year - beginDateTime.Year);
      /*出生日期加總月數(shù)后，如果大于當(dāng)前日期則減一個(gè)月*/
      int totalMonth = (beginDateTime.AddMonths(Months) > endDateTime) ? Months - 1 : Months;
      /*計(jì)算整年*/
      int fullYear = totalMonth / 12;
      /*計(jì)算整月*/
      int fullMonth = totalMonth % 12;
      /*計(jì)算天數(shù)*/
      DateTime changeDate = beginDateTime.AddMonths(totalMonth);
      double days = (endDateTime - changeDate).TotalDays;
    }
  }
}

public int CalculateAgeCorrect(DateTime birthDate, DateTime now)
{
  int age = now.Year - birthDate.Year;
  if (now.Month < birthDate.Month || (now.Month == birthDate.Month && now.Day < birthDate.Day)) age--;
  return age;
}

    string m_Str = "1984-04-04";
    int m_Y1 = DateTime.Parse(m_Str).Year;
    int m_Y2 = DateTime.Now.Year;
    int m_Age = m_Y2 - m_Y1;
    Response.Write(m_Age);

 

  int now =int.Parse(DateTime.Today.ToString("yyyyMMdd"));

  int dob =int.Parse(dateDOB.ToString("yyyyMMdd"));

  string dif =(now - dob).ToString();

  string age ="0";

  if(dif.Length>4)
    age = dif.Substring(0, dif.Length-4);

DateTime now =DateTime.Today;

int age = now.Year- bday.Year;

if(bday > now.AddYears(-age)) age--;