通过出生日期和当前日期计算年，月，天(我的年龄、在职日期)

常见应用：

我多大了，在职时间

C#代码：

 1     /// 通过出生日期和当前日期计算年，月，天

 2     /// </summary>

 3     /// <param name="birth">出生日期</param>

 4     /// <param name="now">当前日期</param>

 5     /// <param name="year">年</param>

 6     /// <param name="month">月</param>

 7     /// <param name="day">天</param>

 8     private void GetDateByBirth(DateTime birth, DateTime now, out int year, out int month,

 9     out int day)

10     {

11         //出生日期的年，月，日

12         int birthYear = birth.Year;

13         int birthMonth = birth.Month;

14         int birthDay = birth.Day;

15 

16         //当前时间的年,月,日

17         int nowYear = now.Year;

18         int nowMonth = now.Month;

19         int nowDay = now.Day;

20 

21         //得到天

22         if (nowDay >= birthDay)

23         {

24             day = nowDay - birthDay;

25         }

26         else

27         {

28             nowMonth -= 1;

29             day = GetDay(nowMonth, nowYear) + nowDay - birthDay;

30         }

31 

32         //得到月

33         if (nowMonth >= birthMonth)

34         {

35             month = nowMonth - birthMonth;

36         }

37         else

38         {

39             nowYear -= 1;

40             month = 12 + nowMonth - birthMonth;

41         }

42 

43         //得到年

44         year = nowYear - birthYear;

45     }

46 

47     /// <summary>

48     /// 获取天数

49     /// </summary>

50     private int GetDay(int month, int year)

51     {

52         int day = 0;

53         switch (month)

54         {

55             case 1:

56             case 3:

57             case 5:

58             case 7:

59             case 8:

60             case 10:

61             case 12:

62                 day = 31;

63                 break;

64             case 2:

65                 //闰年天，平年天

66                 if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)

67                 {

68                     day = 29;

69                 }

70                 else

71                 {

72                     day = 28;

73                 }

74                 break;

75             case 4:

76             case 6:

77             case 9:

78             case 11:

79                 day = 30;

80                 break;

81         }

82         return day;

83     }

 Js代码：

 1 function GetDateValue(entry){

 2             //差值

 3             var year;

 4             var month;

 5             var day;

 6 

 7             //入职日期

 8             var dateArr = entry.split("-");

 9             var entry_year = parseInt(dateArr[0]);

10             var entry_month = parseInt(dateArr[1]);

11             var entry_day = parseInt(dateArr[2]);

12             //当前日期

13             var d = new Date();

14             var now_year = d.getFullYear();

15             var now_day = d.getDate();

16             var now_month = d.getMonth() + 1;

17 

18             //得到天

19             if(now_day >= entry_day){

20                 day = now_day - entry_day;

21             }else{

22                 now_month = now_month - 1;

23                 day = GetDay(now_month,now_year) + now_day - entry_day;

24             }

25             //得到月

26             if(now_month >= entry_month){

27                 month = now_month - entry_month;

28             }else{

29                 now_year = now_year -1;

30                 month = 12 + now_month - entry_month;

31             }

32             //得到年

33             year = now_year - entry_year;

34 

35             //字符串

36             var basic_experience = " 在职";

37             if (year != 0)

38                 basic_experience += Math.abs(year) + "年";

39             if (month != 0)

40                 basic_experience += Math.abs(month) + "月";

41             if (day != 0)

42                 basic_experience += Math.abs(day) + "天";

43             return basic_experience;

44         }

45         //获取天

46         function GetDay(month,year){

47             var day = 0;

48             if(month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12){

49                 day = 31;

50             }else if(month == 2){

51                 if(year % 4 == 0 && year % 100 !=0 || year % 400 == 0){ 

52                     day = 29;

53                 }else{

54                     day = 28;

55                 }

56             }else if(month == 4 || month == 6 || month == 9 || month == 11){

57                 day = 30;

58             }

59             return day;

60         }