C# 根据出生年月 计算天数/计算X岁X月X天字符串

 1  public class TimeTool 2  { 3   //根据出生年月计算 整数天 4   private static int GetAgeByBirthdate(DateTime birthdate) 5   { 6    DateTime now = DateTime.Now; 7    int age = now.Year - birthdate.Year; 8    if (now.Month < birthdate.Month || (now.Month == birthdate.Month && now.Day < birthdate.Day)) 9    {10     age--;11    }12    return age < 0 ? 0 : age;13   }
   //根据出生年月计算 X岁或X月X天或X天14   public static string GetAgeByBirthday(DateTime birthday)15   {16    var currenttime = DateTime.Now;17    var diffTime = currenttime - birthday;18    if (diffTime.TotalDays >= 365)19    {20     //年龄计算21     return GetAgeByBirthdate(birthday).ToString() + "岁";22    }23    else24    {25     //个月计算26     var diffmonth = currenttime.Month - birthday.Month;27     var day = currenttime.Day - birthday.Day;28     if (day < 0)29     {30      diffmonth--;31     }32     if (diffmonth > 0)33     {34      DateTime newbirthday = birthday.AddMonths(diffmonth);35      day = (int)((currenttime - newbirthday).TotalDays);36      return diffmonth.ToString() + "个月" + (day == 0 ? "" : day.ToString() + "天");37     }38     else39     {40      //直接计算天41      return ((int)(diffTime.TotalDays)).ToString() + "天";42     }43    }44 45   }46  }

 

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