NSString *dateStr=[dic objectForKey:@"date"];// 2012-05-17 11:23:23      NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];       NSUInteger unitFlags = NSMonthCalendarUnit | NSDayCalendarUnit;      NSDateFormatter *format=[[NSDateFormatter alloc] init];      [format setDateFormat:@"yyyy-MM-dd HH:mm:ss"];      NSDate *fromdate=[format dateFromString:dateStr];      NSTimeZone *fromzone = [NSTimeZone systemTimeZone];      NSInteger frominterval = [fromzone secondsFromGMTForDate: fromdate];      NSDate *fromDate = [fromdate  dateByAddingTimeInterval: frominterval];       NSLog(@"fromdate=%@",fromDate);      [format release];      NSDate *date = [NSDate date];      NSTimeZone *zone = [NSTimeZone systemTimeZone];      NSInteger interval = [zone secondsFromGMTForDate: date];      NSDate *localeDate = [date  dateByAddingTimeInterval: interval];      NSLog(@"enddate=%@",localeDate);      NSDateComponents *components = [gregorian components:unitFlags fromDate:fromDate toDate:localeDate options:0];      NSInteger months = [components month];      NSInteger days = [components day];//年[components year]      NSLog(@"month=%d",months);      NSLog(@"days=%d",days);      [gregorian release];      if (months==0&&days;==0) {          dateStr=[[dateStr substringFromIndex:11]substringToIndex:5];          cell.textLabel.text=[NSString stringWithFormat:@"今天 %@",dateStr];//今天 11:23      }else if(months==0&&days;==1){          dateStr=[[dateStr substringFromIndex:11]substringToIndex:5];          cell.textLabel.text=[NSString stringWithFormat:@"昨天 %@",dateStr];//昨天 11:23      }else{          dateStr=[dateStr substringToIndex:10];          cell.textLabel.text=dateStr;      }