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[OC Foundation框架 - 15] NSDate

2024-08-04 04:06:20   221人阅读

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 sec12     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 double27     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2013-05-052         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);
 

[OC Foundation框架 - 15] NSDate


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