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NSTimeInterval timeZoneOffset = [[NSTimeZone defaultTimeZone] secondsFromGMT];
NSDate* today = [[NSDate date] dateByAddingTimeInterval:timeZoneOffset];

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a ver el timestamp...

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- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}

- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section {
    //This is just for avoiding separation lines in empty rows (needs "numberOfSectionsInTableView")
    if ([self numberOfSectionsInTableView:tableView] == (section+1)){
        return [UIView new];

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+ (UIImage *)scaleImage:(UIImage *)image ToSize:(CGSize)newSize {
    //UIGraphicsBeginImageContext(newSize);
    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}

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CGSize s = originalImage.size;
CGSize s2 = [UIScreen mainScreen].bounds.size;

CGSize s3 = CGSizeMake(roundf(s.width / s2.width), roundf(s.height/s2.height));
CGFloat factor = fmax(s3.width, s3.height);
        
// Divide the size by the greater of the vertical or horizontal shrinkage factor
s.width = roundf(s.width /factor);
s.height = roundf (s.height / factor);
        

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- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSString *newSearch = [textField.text stringByReplacingCharactersInRange:range withString:string];
    NSLog(@"%@",newSearch);
    
    if ([newSearch length] >= MIN_NUMBER_OF_CHARACTERS_TO_LAUCH_SEARCH)
    {
        //Hacer búsqueda con newSearch
    }
    

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+ (UIImage *)convertImageToGrayScale:(UIImage *)img
{
    // Create image rectangle with current image width/height
    CGRect imageRect = CGRectMake(0, 0, img.size.width, img.size.height);
    
    // Grayscale color space
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();
    
    // Create bitmap content with current image size and grayscale colorspace
    CGContextRef context = CGBitmapContextCreate(nil, img.size.width, img.size.height, 8, 0, colorSpace, kCGImageAlphaNone);

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#import "NSMutableArray+Stack.h"
#define SHOW_ANIMATION_DURATON 0.5f

@property (nonatomic, strong) NSMutableArray *viewStack;

-(void)pushView:(UIView *)view
{
    UIView *anterior = [self.viewStack peek];
    [self.viewStack push:view];
    

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@property (strong, nonatomic) IBOutlet UITextField *pin1_1;
@property (strong, nonatomic) IBOutlet UITextField *pin1_2;
@property (strong, nonatomic) IBOutlet UITextField *pin1_3;
@property (strong, nonatomic) IBOutlet UITextField *pin1_4;
@property (nonatomic, strong) NSString *pinText;


- (void)viewDidLoad
{
	(...)

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// UIBarButtonItem+Image.h

@interface UIBarButtonItem (Image)

-(id)initWithImage:(UIImage *)image title:(NSString*)title target:(id)target action:(SEL)action;

@end