Two problems with data when using create and save

I have a create and save calls as shown below.  Whilst these actually create a record on the database there are two problems with the data that is saved:

1. the "fee" field value is "0.00", even though the value of $fee at run time is "0.67".  Note that the type of "fee" on the database is "decimal 10, 2".

2. the value of the "created" field is "0000-00-00 00:00:00".

 

  $sub_data = array(
   'Sub' => array(
    'user_id' => $user_id,
    'payer_id' => $payer_id,
    'payer_email' => $payer_email,
    'start_dt' => date('Y-m-d', $start_dt),
    'end_dt' => date('Y-m-d', $start_dt + $this->getDays($amount)*86400),
    'txn_id' => $txn_id,
    'amount' => $amount,
    'fee' => $fee
   )
  );
  $this->Sub->create();
  $this->logRes($amount, $fee);
  return $this->Sub->save($sub_data);

What is causing these values of the database?

 

Thanks.

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