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             else 24             { 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                 else 39                 { 40                     //直接计算天 41                     return ((int)(diffTime.TotalDays)).ToString() + "天"; 42                 } 43             } 44  45         } 46     }