Difference between date to calculate months in BPEL

Hello Team,
I need your help to calculate Date difference between input date with current date and get the months in BPEL 2.0
Please suggest.

getting below error, input is xsd:date
<bpelFault>
<faultType>0</faultType>
<subLanguageExecutionFault>
<part name="summary">
<summary>An error occurs while processing the XPath expression; the expression is xp20:month-from-dateTime(xp20:current-date()) - xp20:month-from-dateTime($inputVariable.payload/client:inputDt).</summary>
</part>
<part name="detail">
<detail>XPath expression failed to execute. An error occurs while processing the XPath expression; the expression is xp20:month-from-dateTime(xp20:current-date()) - xp20:month-from-dateTime($inputVariable.payload/client:inputDt). The XPath expression failed to execute; the reason was: internal xpath error. Check the detailed root cause described in the exception message text and verify that the XPath query is correct. </detail>
</part>
<part name="code">
<code>XPath expression failed to execute</code>
</part>
</subLanguageExecutionFault>
</bpelFault>

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