How To change day like calendar's next prev button..

#pragma mark view calnder Next Prev

-(IBAction)btnRigth_Clicked:(id)sender{

    NSLog(@"\n Right Button Clicked");

    [self NextDate:lblTitleDate.text];

}

-(IBAction)btnLeft_Clicked:(id)sender{

    NSLog(@"\n Left Button Clicked");

    [self PrevDate:lblTitleDate.text];

}

-(void)NextDate:(NSString *)strDate{

    

    NSDate *selectedDate = [[NSDate alloc]init];

    selectedDate = [self convertStringToDate:strDate];

    

    // start by retrieving day, weekday, month and year components for yourDate

    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

    NSDateComponents *todayComponents = [gregorian components:(NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit) fromDate:selectedDate];

    NSInteger theDay = [todayComponents day];

    NSInteger theMonth = [todayComponents month];

    NSInteger theYear = [todayComponents year];

    

    // now build a NSDate object for yourDate using these components

    NSDateComponents *components = [[NSDateComponents alloc] init];

    [components setDay:theDay]; 

    [components setMonth:theMonth]; 

    [components setYear:theYear];

    NSDate *thisDate = [gregorian dateFromComponents:components];

    [components release];

    

    // now build a NSDate object for the next day

    NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];

    [offsetComponents setDay:1];

    NSDate *nextDate = [gregorian dateByAddingComponents:offsetComponents toDate:thisDate options:0];

    [offsetComponents release];

    [gregorian release];

    lblTitleDate.text = [self convertDateToString:nextDate];

}

-(void)PrevDate:(NSString *)strDate{

    

    NSDate *selectedDate = [[NSDate alloc]init];

    selectedDate = [self convertStringToDate:strDate];

    // start by retrieving day, weekday, month and year components for yourDate

    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

    NSDateComponents *todayComponents = [gregorian components:(NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit) fromDate:selectedDate];

    NSInteger theDay = [todayComponents day];

    NSInteger theMonth = [todayComponents month];

    NSInteger theYear = [todayComponents year];

    

    // now build a NSDate object for yourDate using these components

    NSDateComponents *components = [[NSDateComponents alloc] init];

    [components setDay:theDay]; 

    [components setMonth:theMonth]; 

    [components setYear:theYear];

    NSDate *thisDate = [gregorian dateFromComponents:components];

    [components release];

    

    // now build a NSDate object for the next day

    NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];

    [offsetComponents setDay:-1];

    NSDate *prevDate = [gregorian dateByAddingComponents:offsetComponents toDate:thisDate options:0];

    [offsetComponents release];

    [gregorian release];

    lblTitleDate.text = [self convertDateToString:prevDate];

}

-(NSDate *)convertStringToDate:(NSString *) date {

    NSDateFormatter *formatter = [[[NSDateFormatter alloc] init] autorelease]; 

    NSDate *nowDate = [[[NSDate alloc] init] autorelease];

    [formatter setDateFormat:@"EEEE, dd MMM yyyy"];// set format here which format in string date

    date = [date stringByReplacingOccurrencesOfString:@"+0000" withString:@""];

    nowDate = [formatter dateFromString:date];

    // NSLog(@"date============================>>>>>>>>>>>>>>> : %@", nowDate);

    return nowDate;

}

-(NSString *)convertDateToString:(NSDate *) date {

    NSDateFormatter *formatter = [[[NSDateFormatter alloc] init] autorelease]; 

    NSString *nowDate = [[[NSString alloc] init] autorelease];

    [formatter setDateFormat:@"EEEE, dd MMM yyyy"];// set format here which format in string date

    

    nowDate = [formatter stringFromDate:date];

    // NSLog(@"date============================>>>>>>>>>>>>>>> : %@", nowDate);

    return nowDate;

}