`ascending` and `descending` are confusing.

a.m

@import Foundation;

int main()
{
  NSDate * const a = [[NSDate alloc] initWithTimeIntervalSince1970:0];
  NSDate * const b = [[NSDate alloc] initWithTimeIntervalSince1970:1];

  NSLog(@"%d", (int)[a compare:b]); // -1 = NSOrderedAscending
  NSLog(@"%d", (int)[a compare:a]); //  0 = NSOrderedSame
  NSLog(@"%d", (int)[b compare:a]); //  1 = NSOrderedDescending

  return 0;
}