Question

Possible Duplicate:
NSDateFormatter not giving me correct

I am using a NSDate which I convert to only the date using the following technique:

+ (NSDate *) dateOnly:(NSDate *)date
{
    long time = [date timeIntervalSinceReferenceDate];
    long timeMod = time % kNumSecondsInDay;
    NSTimeInterval newTime = time - timeMod;

    return [[NSDate alloc] initWithTimeIntervalSinceReferenceDate:newTime];
}

This is giving me expected results:

    NSLog(@"Due Date:%@", _dueDate);

–> Due Date: 2012-11-21 00:00:00 +0000

However, when I use the date formatter, it gives me one day previous:

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateStyle:NSDateFormatterShortStyle];
    NSString *result = [formatter stringFromDate:_dueDate];
    NSLog(@"Result: %@", result);

–> Result: 11/20/12

What gives?

Answer 1

Time zone. The date is midnight on 11/21, UTC; if your time zone is behind UTC, then it’ll be 11/20.