+(NSString *) fetchTime
{
    NSString *timeString=@"not_set";

    //Code for URL request here
    NSURL *timeURL = [NSURL URLWithString:@"http://www.timeapi.org/utc/now"]

    return timeString;
}

NSURL *timeURL = [NSURL URLWithString:@"http://www.timeapi.org/utc/now"]
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url
                                            cachePolicy:NSURLRequestReloadIgnoringCacheData
                                        timeoutInterval:120];
NSData *urlData;
NSURLResponse *response;
NSError *error;

urlData = [NSURLConnection sendSynchronousRequest:urlRequest
                                returningResponse:&response
                                            error:&error];

NSString *string = [[NSString alloc] initWithData:urlData encoding:NSUTF8StringEncoding];

-(void) fetchTimeFromServerWithCompletionHandler:(void(^)(id)) onComplete {
            NSURLRequest *timeRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.timeapi.org/utc/now"]];
        [NSURLConnection sendAsynchronousRequest:timeRequest queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *urlResponse, NSData *data, NSError *error) {
            // Do something usefull with Data.
            // If expected object is a String, alloc init a String with received Data
            NSString *time = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
            onComplete(time); // This will return back the time string.
        }];
}

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
[manager GET:@"http://example.com/resources.json" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"JSON: %@", responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Error: %@", error);
}];