Q6. Get launched time of Application.

gistfile1.txt

Any time is printed in Console. It isn't application start time.
+ initialize method may not invoked or lazily invoked.
So if you need the launched time of application, you must write the code in main function.
- AppDelegate.m
 NSString * startTime;
- main.m
extern NString *startTime;
int main(int argc, char* argv[]) {
 @autoreleasepool {
        NSDateFormatter *formatter = [NSDateFormatter new];
        formatter.dateStyle = NSDateFormatterNoStyle;
        formatter.timeStyle = NSDateFormatterMediumStyle;
        startTime = [formatter stringFromDate:[NSDate date]];

        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));  
  }
}