Converting Oracle query to Sql Server with date manipulation

The following SSIS statement works great in Oracle, and it parses successfully in the "Sql Task" window. In Oracle it returns
this result:
FROM_DT THRU_DT
16-Jan-2014 23-Jan-2014
select
case
when to_char(to_date(sysdate,'dd-mon-yyyy'),'dd') <=7 then to_date('24'||to_char(add_months(sysdate,-1),'mmyyyy'),'ddmmyyyy')
when to_char(to_date(sysdate,'dd-mon-yyyy'),'dd') <=15 then to_date('01'||to_char(sysdate,'mmyyyy'),'ddmmyyyy')
when to_char(to_date(sysdate,'dd-mon-yyyy'),'dd') <=23 then to_date('08'||to_char(sysdate,'mmyyyy'),'ddmmyyyy')
else to_date('16'||to_char(sysdate,'mmyyyy'),'ddmmyyyy')
end as from_dt,
case
when to_char(to_date(sysdate,'dd-mon-yyyy'),'dd') <=7 then trunc(last_day(add_months(sysdate,-1)))
when to_char(to_date(sysdate,'dd-mon-yyyy'),'dd') <=15 then to_date('07'||to_char(sysdate,'mmyyyy'),'ddmmyyyy')
when to_char(to_date(sysdate,'dd-mon-yyyy'),'dd') <=23 then to_date('15'||to_char(sysdate,'mmyyyy'),'ddmmyyyy')
else to_date('23'||to_char(sysdate,'mmyyyy'),'ddmmyyyy')
end as thru_dt
from sys.dual
How can I convert this to Sql Server ?

>>You mean you get the data from Oracle and tries to insert it into SQL Server?
- no, sorry, I want to convert the syntax to Sql Server
>>Are
you running the query in OLEDB provider connected to the Oracle's database?
- yes, this works fine now (after fixing this redundancy:
to_char(to_date(sysdate,'dd-mon-yyyy'),'dd')change toto_char(sysdate,'dd')

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