NSDataDetector *detector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingAllTypes error:&error];
      NSArray *matches = [detector matchesInString:datestring
                                     options:0
                                       range:NSMakeRange(0, [datestring length])];


    for (NSTextCheckingResult *match in matches) {
       if ([match resultType] == NSTextCheckingTypeDate) {
           dateObj =  [match date];
           break;
    }
}