[OC Foundation框架 - 15] NSDate

日期处理类

1. 定义
2. 时间间隔计算
3. 时间比较，返回其一
4. 时间格式化

 1 void dateCreate()

 2 {

 3     //date return current time

 4     NSDate *date = [NSDate date];

 5     NSLog(@"%@", date);

 6    

 7     //+ 10 sec

 8     date = [NSDate dateWithTimeIntervalSinceNow:10];

 9     NSLog(@"%@", date);

10    

11     //1970-1-1 00:00:00 + 10 sec

12     date = [NSDate dateWithTimeIntervalSince1970:10];

13     NSLog(@"%@", date);

14    

15     //Random future time?

16     date = [NSDate distantFuture];

17     NSLog(@"%@", date);

18    

19     date = [NSDate distantPast];

20     NSLog(@"%@", date);

21 }

22  

23 void dateUse()

24 {

25     NSDate *date = [NSDate date];

26     //NSTimeInterval is double

27     NSTimeInterval i = [date timeIntervalSince1970];

28     NSLog(@"%f", i);

29 }

30  

31 void dateFormat()

32 {

33     NSDate *date = [NSDate date];

34     NSDateFormatter *f = [[NSDateFormatter alloc] init];

35     f.dateFormat = @"yyyy-MMM-dd HH:mm:ss";

36     NSString *s = [f stringFromDate:date];

37     NSLog(@"1:%@", s);

38    

39     NSDate *d2 = [f dateFromString:@"2014-7月-29 22:12:12"];

40     NSLog(@"2:%@",d2);

41 }

 

字符串、日期格式转换：

1         // 17.将2013年05月05日转换为2013-05-05

2         NSMutableString *str17 = @"2013年05月05日";

3         NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc] init];

4         dateFormatter1.dateFormat = @"yyyy年MM月dd日";

5         NSDate *date1 = [dateFormatter1 dateFromString:str17];

6         NSDateFormatter *dateFormatter2 = [[NSDateFormatter alloc] init];

7         dateFormatter2.dateFormat = @"yyyy-MM-dd";

8         NSString *str17_2 = [dateFormatter2 stringFromDate:date1];

9         NSLog(@"题目17, 转换后的日期是%@", str17_2);