Nominal to date error in month conversion

Hello,

I'm trying to convert some nominal attributes containing dates in format like this "yyyymmdd" (for example: 20091205 for December 5, 2009). I used the nominal to date node specifying in the "date format" parameters the format of my data.

The node execute without errors and convert values in this format: "Jan 18, 2010".

However, day and year are correct but the month is always January, for ALL the values (but numbers are different of course).

I can't understand why, can someone help me with this?

Thank you in advance!

[Following my XML]

<?xml version="1.0" encoding="UTF-8"?><process version="7.6.001">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="7.6.001" expanded="true" name="Process">
    <process expanded="true">
      <operator activated="true" class="retrieve" compatibility="7.6.001" expanded="true" height="68" name="Retrieve final_dataset" width="90" x="45" y="136">
        <parameter key="repository_entry" value="//Local Repository/data/final_dataset"/>
      </operator>
      <operator activated="true" class="select_attributes" compatibility="7.6.001" expanded="true" height="82" name="Select Attributes" width="90" x="179" y="136">
        <parameter key="attribute_filter_type" value="subset"/>
        <parameter key="attributes" value="COD_OPE|FIN_DTIA"/>
      </operator>
      <operator activated="true" class="nominal_to_date" compatibility="7.6.001" expanded="true" height="82" name="Nominal to Date" width="90" x="380" y="136">
        <parameter key="attribute_name" value="FIN_DTIA"/>
        <parameter key="date_format" value="yyyymmdd"/>
      </operator>
      <connect from_op="Retrieve final_dataset" from_port="output" to_op="Select Attributes" to_port="example set input"/>
      <connect from_op="Select Attributes" from_port="example set output" to_op="Nominal to Date" to_port="example set input"/>
      <connect from_op="Nominal to Date" from_port="example set output" to_port="result 1"/>
      <connect from_op="Nominal to Date" from_port="original" to_port="result 2"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
      <portSpacing port="sink_result 2" spacing="0"/>
      <portSpacing port="sink_result 3" spacing="0"/>
    </process>
  </operator>
</process>