Conversion of Informix functions to Oracle

Hi,
Can anyone help me in the conversion of the following informix functions to Oracle
dtcvasc()
rftmtdate()
deccvasc()
rdefmtdate()
dttoasc()
rtoday()
These functions exists in ESQL/c(informix). Please help in converting the aboue functions to oracle .
regards,
gopu

Can you explain what these functions do? There are probably Oracle analogs already.
Justin

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