- (NSInteger)getTimePeriod:(NSDate *)date{    for (NSInteger i = 1; i <= 24; i ++)    {        if ([date compare:[self getCustomDateWithHour:i - 1 date:date]] == NSOrderedDescending && [date compare:[self getCustomDateWithHour:i date:date]] == NSOrderedAscending)        {            return i;        }        if ([date compare:[self getCustomDateWithHour:i date:date]] == NSOrderedSame)        {            return i;        }    }        return 0;}- (NSDate *)getCustomDateWithHour:(NSInteger)hour date:(NSDate *)date{    NSCalendar *currentCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];    NSDateComponents *currentComps = [[NSDateComponents alloc] init];    NSInteger unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;        currentComps = [currentCalendar components:unitFlags fromDate:date];        NSDateComponents *resultComps = [[NSDateComponents alloc] init];    [resultComps setYear:[currentComps year]];    [resultComps setMonth:[currentComps month]];    [resultComps setDay:[currentComps day]];    [resultComps setHour:hour];        NSCalendar *resultCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];    return [resultCalendar dateFromComponents:resultComps];}