17，Objective-C Foundation框架中的NSDate

本文主要是介绍17，Objective-C Foundation框架中的NSDate，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

获取时间、考虑时区、时间格式

- (void)viewDidLoad
{[super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.//获取当前时间NSDate *now = [NSDate date];NSLog(@"It's %@ now,",now);//获取距离某个时间点的时间NSDate *then = [[NSDate alloc] initWithTimeInterval:3600 sinceDate:now];NSLog(@"after 3600 second:%@",then);//考虑时区NSTimeZone *zone = [NSTimeZone systemTimeZone];NSInteger interval = [zone secondsFromGMTForDate:now];NSDate *localDate = [now dateByAddingTimeInterval:interval];NSLog(@"the local date is %@",localDate);//时间格式NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];[dateFormatter setDateFormat:@"年月日 YYYY/mm/dd 时间 hh:mm:ss"];  //设置时间格式NSString *dateString = [dateFormatter stringFromDate:[NSDate date]];NSLog(@"dateString = %@",dateString);[dateFormatter setDateFormat:@"YYYY-MM-dd"];NSString *date = [dateFormatter stringFromDate:[NSDate date]];NSLog(@"年月日 date = %@",date);[dateFormatter setDateFormat:@"hh:mm:ss"];NSString *time = [dateFormatter stringFromDate:[NSDate date]];NSLog(@"时间 time = %@",time);
}

日期的比较

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