Cocoa vs. Rails method returning the end of current month

gistfile1.m

- (NSDate *)endOfThisMonth {
    NSDate *endOfMonth = [NSDate date];
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *comp = [calendar components:(NSWeekdayCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) fromDate:[NSDate date]];
    [comp setMonth:[comp month]+1];
    [comp setDay:1];
    endOfMonth = [calendar dateFromComponents:comp];
    return [endOfMonth dateByAddingTimeInterval:-(60*60*24)];
}

gistfile2.rb

def end_of_this_month
  Time.now.end_of_month
end