operator -
operator- subtracts the supplied value, from the supplied OracleTimeStampTZ value, and returns a new OracleTimeStampTZ structure. 
                  
Overload List:
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                        operator - (OracleTimeStampTZ, OracleIntervalDS) This static operator subtracts the supplied OracleIntervalDSvalue, from the suppliedOracleTimeStampTZvalue, and return a newOracleTimeStampTZstructure.
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                        operator - (OracleTimeStampTZ, OracleIntervalYM) This static operator subtracts the supplied OracleIntervalYMvalue, from the suppliedOracleTimeStampTZvalue, and returns a newOracleTimeStampTZstructure.
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                        operator - (OracleTimeStampTZ value1, TimeSpan value2) This static operator subtracts the supplied TimeSpanvalue, from the suppliedOracleTimeStampTZvalue, and returns a newOracleTimeStampTZstructure.