High-resolution timer for the iPhone

Question

The NSDate class is actually very high-resolution.
NSDate *startDate = [[NSDate alloc] init];
// do something
NSDate *endDate = [[NSDate alloc] init];
double seconds = [endDate timeIntervalSinceDate:startDate];
iPhone simulator: 0.001013 or 0.000983 ms accuracy (about twice as long as it takes to pull the date)
iPhone debug: between about 0.014 and 0.015 ms accuracy (it takes that long to pull the date)
The [NSDate date] might be simpler than alloc and init, but it actually takes about 3 millionths of a second longer on the simulator.

Answer 1

So are you asking for a way to obtain a timestamp with less latency or how to implement a timer?