__dataArea = [NSMutableData data];
__unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:__dataArea];
__archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:__dataArea];

__iDates = [[BCimportantDates alloc] initWithCoder:[NSKeyedUnarchiver unarchiveObjectWithFile: @"firstDate.arch"]];

if ((__iDates.firstDate == nil)){

    NSDate *date = [NSDate date];
    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier: NSGregorianCalendar];
    NSDateComponents *components = [gregorian components: NSUIntegerMax fromDate: date];
    NSLog(@"the date %@",date);
    [components setHour: 3];
    [components setMinute: 00];
    [components setSecond: 00];
    __newDate = [gregorian dateFromComponents: components];
    [__iDates setFirstDate: __newDate];
    NSLog(@"%@",__iDates.firstDate);
    [__iDates encodeWithCoder: __archiver];
    [__archiver finishEncoding];
    if ([__dataArea writeToFile:@"firstDate.arch" atomically:YES] == NO){
        NSLog(@"archiving failed. ");
    }
}

- (void) encodeWithCoder:(NSCoder *)encoder{
    [encoder encodeObject: __firstDate forKey: kfirstDateKey];
}

- (id) initWithCoder: (NSCoder *) decoder{
    if (self = [super init]) {
    self.firstDate = [decoder decodeObjectForKey:kfirstDateKey];
    }
    return self;
}

NSString *path = [NSTemporaryDirectory() stringByAppendingPathComponent:@"firstDate.arch"];

if ([__dataArea writeToFile:path atomically:YES] == NO){
    NSLog(@"archiving failed. ");
}