[OC Foundation框架

日期处理类

定义
时间间隔计算
时间比较，返回其一
时间格式化

 void dateCreate()

 {

     //date return current time

     NSDate *date = [NSDate date];

     NSLog(@"%@", date);

     //+ 10 sec

     date = [NSDate dateWithTimeIntervalSinceNow:];

     NSLog(@"%@", date);

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

     date = [NSDate dateWithTimeIntervalSince1970:];

     NSLog(@"%@", date);

     //Random future time?

     date = [NSDate distantFuture];

     NSLog(@"%@", date);

     date = [NSDate distantPast];

     NSLog(@"%@", date);

 }

 void dateUse()

 {

     NSDate *date = [NSDate date];

     //NSTimeInterval is double

     NSTimeInterval i = [date timeIntervalSince1970];

     NSLog(@"%f", i);

 }

 void dateFormat()

 {

     NSDate *date = [NSDate date];

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

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

     NSString *s = [f stringFromDate:date];

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

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

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

 }

字符串、日期格式转换：

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

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

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

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

         NSDate *date1 = [dateFormatter1 dateFromString:str17];

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

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

         NSString *str17_2 = [dateFormatter2 stringFromDate:date1];

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

巴特西

[OC Foundation框架 - 15] NSDate

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