From this code I'm getting the error below

```
require "vendor/autoload.php";
use Aws\Common\Aws;
use Aws\DynamoDb\DynamoDbClient;
use Aws\DynamoDb\Enum\ComparisonOperator;
use Aws\DynamoDb\Enum\KeyType;
use Aws\DynamoDb\Enum\Type;

$aws = Aws::factory(array(
'key'    => '[clipped]',
'secret' => '[clipped]',
'region' => Region::US_WEST_1
));

$client = $aws->get("dynamodb");
$tableName = "ExampleTable";

$result = $client->createTable(array(
    "TableName" => $tableName,
    "AttributeDefinitions" => array(
        array(
           "AttributeName" => "Id",
           "AttributeType" => Type::NUMBER
        )
     ),
     "KeySchema" => array(
        array(
           "AttributeName" => "Id",
           "KeyType" => KeyType::HASH
        )
    ),
    "ProvisionedThroughput" => array(
        "ReadCapacityUnits"    => 5,
        "WriteCapacityUnits" => 6
    )
));

print_r($result->getPath('TableDescription'));

```

I'm getting the following error when trying to add a table into AWS's DynamoDB.

```
PHP Fatal error:  Uncaught Aws\\DynamoDb\\Exception\\DynamoDbException: AWS Error Code:
InvalidSignatureException, 
Status Code: 400, 
AWS Request ID: [clipped], 
AWS Error Type: client, 
AWS Error Message: Signature expired: 20130818T021159Z is now earlier than  
20130818T021432Z (20130818T022932Z - 15 min.), 
User-Agent: aws-sdk-php2/2.4.3 Guzzle/3.7.2 curl/7.21.6 PHP/5.3.6-13ubuntu3.9\n  thrown in
/var/www/vendor/aws/aws-sdk-php/src/Aws/Common/Exception/NamespaceExceptionFactory.php on
line 91

```

So far I've:

* Checked to see if Authentication Key and Secret Key were correct, they were.
* Updated cURL
* When I put false authentication permissions in, the error didn't change.