Java 根据年月日精确计算年龄

 1 import java.text.SimpleDateFormat;  
 2 import java.util.Calendar;  
 3 import java.util.Date;  
 4   
 5 /** 
 6  * Created by qing on 2017/3/28. 
 7  */  
 8 public class AgeUtils {  
 9     // 根据年月日计算年龄,birthTimeString:"1994-11-14"  
10     public static int getAgeFromBirthTime(String birthTimeString) {  
11         // 先截取到字符串中的年、月、日  
12         String strs[] = birthTimeString.trim().split("-");  
13         int selectYear = Integer.parseInt(strs[0]);  
14         int selectMonth = Integer.parseInt(strs[1]);  
15         int selectDay = Integer.parseInt(strs[2]);  
16         // 得到当前时间的年、月、日  
17         Calendar cal = Calendar.getInstance();  
18         int yearNow = cal.get(Calendar.YEAR);  
19         int monthNow = cal.get(Calendar.MONTH) + 1;  
20         int dayNow = cal.get(Calendar.DATE);  
21   
22         // 用当前年月日减去生日年月日  
23         int yearMinus = yearNow - selectYear;  
24         int monthMinus = monthNow - selectMonth;  
25         int dayMinus = dayNow - selectDay;  
26   
27         int age = yearMinus;// 先大致赋值  
28         if (yearMinus < 0) {// 选了未来的年份  
29             age = 0;  
30         } else if (yearMinus == 0) {// 同年的，要么为1，要么为0  
31             if (monthMinus < 0) {// 选了未来的月份  
32                 age = 0;  
33             } else if (monthMinus == 0) {// 同月份的  
34                 if (dayMinus < 0) {// 选了未来的日期  
35                     age = 0;  
36                 } else if (dayMinus >= 0) {  
37                     age = 1;  
38                 }  
39             } else if (monthMinus > 0) {  
40                 age = 1;  
41             }  
42         } else if (yearMinus > 0) {  
43             if (monthMinus < 0) {// 当前月>生日月  
44             } else if (monthMinus == 0) {// 同月份的，再根据日期计算年龄  
45                 if (dayMinus < 0) {  
46                 } else if (dayMinus >= 0) {  
47                     age = age + 1;  
48                 }  
49             } else if (monthMinus > 0) {  
50                 age = age + 1;  
51             }  
52         }  
53         return age;  
54     }  
55   
56     // 根据时间戳计算年龄  
57     public static int getAgeFromBirthTime(long birthTimeLong) {  
58         Date date = new Date(birthTimeLong * 1000l);  
59         SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");  
60         String birthTimeString = format.format(date);  
61         return getAgeFromBirthTime(birthTimeString);  
62     }  
63 }  

 1 // 根据年月日计算年龄,birthTimeString:"1994-11-14"
 2     public static String getAgeFromBirthTime(String birthTimeString) {
 3         // 先截取到字符串中的年、月、日
 4         String strs[] = birthTimeString.trim().split("-");
 5         int selectYear = Integer.parseInt(strs[0]);
 6         int selectMonth = Integer.parseInt(strs[1]);
 7         int selectDay = Integer.parseInt(strs[2]);
 8         // 得到当前时间的年、月、日
 9         Calendar cal = Calendar.getInstance();
10         int yearNow = cal.get(Calendar.YEAR);
11         int monthNow = cal.get(Calendar.MONTH) + 1;
12         int dayNow = cal.get(Calendar.DATE);
13 
14         // 用当前年月日减去生日年月日
15         int yearMinus = yearNow - selectYear;
16         int monthMinus = monthNow - selectMonth;
17         int dayMinus = dayNow - selectDay;
18         String  ageToMonth= "1月";
19 
20         int age = yearMinus;// 先大致赋值
21         if (yearMinus < 0) {// 选了未来的年份
22             age = 0;
23             ageToMonth = "1月";
24         } else if (monthMinus > 0) {
25             age = 1;
26             ageToMonth = String.valueOf(monthMinus)+"月";
27         } else if (yearMinus > 0) {
28             if (monthMinus < 0) {// 当前月>生日月
29             } else if (monthMinus == 0) {// 同月份的，再根据日期计算年龄
30                 if (dayMinus < 0) {
31                 } else if (dayMinus >= 0) {
32                     age = age + 1;
33                     ageToMonth = String.valueOf(age)+"岁";
34                 }
35             } else if (monthMinus > 0) {
36                 age = age + 1;
37                 ageToMonth = String.valueOf(age)+"岁";
38             }
39         }
40         return ageToMonth;
41     }

1 public static void main(String[] args) {
2         String dataOfBirth = "2017-10-28";
3         String age = getAgeFromBirthTime(dataOfBirth);
4         System.out.println("age:" + age);
5     }