Compare date to number

Hi, I am working with the following SQL statement and can't seem to get the syntax correct:
idSelectQuery=Select "numberprgn" from "SMT1"."CM3R1M1" where "category" != 'KM Document' AND ("sysmodtime" - TO_DATE('1970-01-01', 'YYYY-MM-DD')) * 86400000 > ?
Where the '?' is the current system time as a number - which is actually epoch time.
This statement fails because of: ORA-00932: inconsistent datatypes: expected NUMBER got DATE
I need to be able to compare the sysmodtime to the ? time value, although I can't figure out a way to properly do this... I'm not sure if i can cast sysmodtime to char then to number, because I know its not possible to cast date to number directly.
Anyone have any suggestions to get this to work?
Thanks

i.e TO_DATE('1970-01-01', 'YYYY-MM-DD')) * 86400000 will convert GMT to Central time.I disagree.
when arithmetic operations are done against DATE datatype the basic Unit of Measure is DAY
SYSDATE+1 = tomorrow!
the result of multiplication in top line above results in some day far, FAR, FAR into the future.
I suggest you convert epoch time value into Oracle DATE datatype for direct comparison.
BTW, exactly from where is epoch time obtained to become part of SELECT statement?
Re: How to convert Epoch time to Datetime (YYYYMMDDHH24MMSS)
Edited by: sb92075 on Apr 27, 2011 12:18 PM

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!http://opheim.com/div/accumulated.png!
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Atanas 17-AUG-12        101 18-AUG-12        201        100
Niki   17-AUG-12        201 18-AUG-12        401        200
Joro   17-AUG-12        601 18-AUG-12        801        200
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