operator -
operator- subtracts the supplied value, from the supplied OracleTimeStamp value, and returns a new OracleTimeStamp structure. 
                  
Overload List:
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                        operator - (OracleTimeStamp, OracleIntervalDS) This static operator subtracts the supplied OracleIntervalDSvalue, from the suppliedOracleTimeStampvalue, and return a newOracleTimeStampstructure.
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                        operator - (OracleTimeStamp, OracleIntervalYM) This static operator subtracts the supplied OracleIntervalYMvalue, from the suppliedOracleTimeStampvalue, and returns a newOracleTimeStampstructure.
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                        operator - (OracleTimeStamp, TimeSpan) This static operator subtracts the supplied TimeSpanvalue, from the suppliedOracleTimeStampvalue, and returns a newOracleTimeStampstructure.