iOS TimeInterval =1S

NSInteger kTimeoutDuration=10;

NSDate * oneDate=[NSDate date];

NSDate *limitDate = [oneDate dateByAddingTimeInterval:kTimeoutDuration];

NSLog(@"%@",oneDate);

NSLog(@"%@",limitDate);

TimeInterval 单位为1秒钟

2015-03-09 08:18:15.222 Simple[1227:23639] 2015-03-09 00:18:15 +0000

2015-03-09 08:18:15.223 Simple[1227:23639] 2015-03-09 00:18:25 +0000