Getting unexpected output from NSDateComponents

Question

After comparing two dates (currentDate and _timerStartDate) I get the following output

nstimeinterval: 88.998212
2014-05-14 14:07:08.284  currentDate: 14-05-2014 14:07:08
2014-05-14 14:07:08.284  stopDate: 14-05-2014 14:05:39
2014-05-14 14:07:08.284  hour: 10

This is correct and expected. However when I break timerDate down I get 10 hours from the NSLog...I'm expecting zero. What am I doing wrong?

Here is my code:

NSDate *currentDate = [NSDate date];
NSTimeInterval timeInterval = [currentDate timeIntervalSinceDate:_timerStartDate];
NSDate *timerDate = [NSDate dateWithTimeIntervalSince1970:timeInterval];

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"mm:ss"];
NSString *timeString=[dateFormatter stringFromDate:timerDate];


NSLog(@"nstimeinterval: %f", timeInterval);

[dateFormatter setDateFormat:@"dd-MM-yyyy HH:mm:ss"];

NSLog(@"currentDate: %@", [dateFormatter stringFromDate:currentDate]);
NSLog(@"stopDate: %@", [dateFormatter stringFromDate:_timerStartDate]);


NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components: ( NSHourCalendarUnit | NSYearCalendarUnit) fromDate:timerDate];
NSLog(@"year: %li", (long)components.year);


NSLog(@"timer: %@", timeString);

timerTicksForCounter = timeString;

NSLog(@"hour: %li", (long)components.hour);

Answer 1

What is it you're actually trying to accomplish? To populate an NSDateComponents with the time elapsed between two dates? In that case, you probably want -[NSCalendar components:fromDate:toDate:options:], with the from-date being your start, and the to-date being the current date when you stop. In the mean time, you seem to be doing a lot of complicated and possibly unnecessary mashing of dates together.