Object-C-Foundation-NSDate

NSDate 表达日期表达时间的方法

NSDate *now=[NSDate date]; 获得当前日期

NSDate *tomrrow=[now dateByAddingTimeInterval:24*60*60];

NSComparisonResulte result =[now compare:tomorrow];

if(result==NSOrderedAscending) 递增

NSOrderedDescending

日期处理

NSTimeInterval interval=[tomorrow timeIntervalSinceDate:now]时间差

NSLog(@"lf",interval);

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

[formatter setDateFormat:@"yyyy年MM月dd日 HH:mm:ss"];

NSString *dateString =[formatter stringFromDate:now];