Filtering "created on" date using SQL Expressions

Hi there!
I want to build a filter for opportunities "created on" date.
I need to find all opportunities that were created over 30 days ago in lead stage.
I was trying:
Created on date is Not equal to or is not in:
1) NOW()
2) TimeStampAdd(SQL_TSI_DAY,-30,CURRENT_DATE NOW())
I keep getting an error message.
Any help is appreciated.

I am in the historical opp area, here is the error:
Error getting drill information: SELECT Opportunity."Sales Method Name" saw_0, Territory."Territory Name" saw_1, Opportunity."Sales Stage" saw_2, Opportunity.Name saw_3, Opportunity."Opportunity ID" saw_4, Account."Account Name" saw_5, Account."Account ID" saw_6, Opportunity."Created Date" saw_7, "- Opportunity Custom Attributes".DATE_26 saw_8 FROM "Opportunity Lists" WHERE (Territory."Territory Name" IN ('AC - Mid-Atlantic', 'AC - North Central', 'AC - Northeast', 'AC - Ohio Valley', 'AC - South', 'AC - South Central', 'AC - Southeast', 'AC - Southwest', 'AC - Western', 'Acute Care Sales')) AND (Opportunity."Created Date" <> TimeStampDiff(SQL_TSI_DAY,Opportunity."Created date", VALUEOF(NQ_SESSION.CURRENT_DT)) <= 30) AND (Opportunity."Sales Stage" = 'Lead')
Error Details
Error Codes: YQCO4T56:OPR4ONWY:U9IM8TAC:OI2DL65P
Odbc driver returned an error (SQLExecDirectW).
State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 27002] Near <<=>: Syntax error [nQSError: 26012] . (HY000)
SQL Issued: {call NQSGetLevelDrillability('SELECT Opportunity."Sales Method Name" saw_0, Territory."Territory Name" saw_1, Opportunity."Sales Stage" saw_2, Opportunity.Name saw_3, Opportunity."Opportunity ID" saw_4, Account."Account Name" saw_5, Account."Account ID" saw_6, Opportunity."Created Date" saw_7, "- Opportunity Custom Attributes".DATE_26 saw_8 FROM "Opportunity Lists" WHERE (Territory."Territory Name" IN (''AC - Mid-Atlantic'', ''AC - North Central'', ''AC - Northeast'', ''AC - Ohio Valley'', ''AC - South'', ''AC - South Central'', ''AC - Southeast'', ''AC - Southwest'', ''AC - Western'', ''Acute Care Sales'')) AND (Opportunity."Created Date" <> TimeStampDiff(SQL_TSI_DAY,Opportunity."Created date", VALUEOF(NQ_SESSION.CURRENT_DT)) <= 30) AND (Opportunity."Sales Stage" = ''Lead'')')}

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