How to compare time

Question

How to compare time in Objective C?

if (nowTime > 9:00 PM) && (nowTime < 7:00 AM) 
{
  doSomething;
}

Answer 1

If anybody needs, this is a code to create sections in a tableView according to the date of objects.

Method to get dates for today, yesterday, etc. (taken from ReMail project DateUtil class):

#define DATE_UTIL_SECS_PER_DAY 86400

-(void)refreshData {
    //TODO(gabor): Call this every hour or so to refresh what today, yesterday, etc. mean
    NSCalendar *gregorian = [NSCalendar currentCalendar];
    self.today = [NSDate date];
    self.yesterday = [today dateByAddingTimeInterval:-DATE_UTIL_SECS_PER_DAY];
    self.lastWeek = [today dateByAddingTimeInterval:-6*DATE_UTIL_SECS_PER_DAY];
    self.todayComponents = [gregorian components:(NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit) fromDate:today];
    self.yesterdayComponents = [gregorian components:(NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit) fromDate:yesterday];
    self.dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
}

Method to sort tableData for table view sections according to date:

// Sort tableData objects according to the date
    for (MCMessage *mcMessage in self.tableData) {
        NSDateComponents *components = [[NSCalendar currentCalendar] components:NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit fromDate:mcMessage.dateTime];
        NSInteger day = [components day];
        NSInteger month = [components month];
        NSInteger year = [components year];

        NSLog(@"Day:%d, Month:%d, Year:%d. Today day:%d. Yesterday:%d", day, month, year, dateUtil.todayComponents.day, dateUtil.yesterdayComponents.day);

        if ((dateUtil.todayComponents.day == day) && (dateUtil.todayComponents.month == month) && (dateUtil.todayComponents.year == year))
        {
            [self.todayData addObject:mcMessage];
        }
        else if ((dateUtil.yesterdayComponents.day == day) && (dateUtil.yesterdayComponents.month == month) && (dateUtil.yesterdayComponents.year == year))
        {
            [self.yesterdayData addObject:mcMessage];
        }
        else
        {
            [self.soonerData addObject:mcMessage];
        }
    }