Date incorrect Conversion time
Hi experts,Need help can't seem to understand why the time is wrong.
Under query 'dte_computation_on_data' is the old function that use to convert the date and put it in the table. Problem is when he come back to the effective date of the hour
is incorrect. Need help. Thank you
SELECT -- THIS HERE IS MY TEST TO REVERT TIME AND DATE ON THE FORMULA OF WITH RESPECT TO THEIR FUNCTION
to_char(TO_DATE('19700101', 'YYYYMMDD')+(tb1.dte_computation_on_data/86400),'MM/DD/YYYY') || ' ' ||
to_char(to_date(mod (tb1.dte_computation_on_data,86400) ,'sssss'),'hh24:mi:ss ') revert_test,
systimestamp,tb1.dte_computation_on_data
from
( SELECT -- THIS IS THE FORMULA OF THE OLD FUNCTION THEY USE TO CONVERT DATE TO NUMBER AND INSERTED ON THE ROW
floor((CAST(SYS_EXTRACT_UTC(systimestamp) AS DATE) - TO_DATE('19700101', 'YYYYMMDD')) * 86400) dte_computation_on_data
FROM dual)tb1;
results
---------------------------------------------------------------------------------------
REVERT_TEST SYSTIMESTAMP DTE_COMPUTATION_ON_DATA
05/19/2011 03:46:18 5/19/2011 11:46:18.005171 AM +08:00 1305776778
If you want the result in your local time instead of UTC, just add the difference using TIMEZONE_HOUR:
select to_char(revert_test, 'MM/DD/YYYY HH24:MI:SS') as revert
, to_char(now, 'MM/DD/YYYY HH24:MI:SS') as now
, dte_computation_on_data as comp
, revert_test - now as diff
from
(
SELECT -- THIS HERE IS MY TEST TO REVERT TIME AND DATE ON THE FORMULA OF WITH RESPECT TO THEIR FUNCTION
to_date(to_char(TO_DATE('19700101', 'YYYYMMDD')+(tb1.dte_computation_on_data/86400),'MM/DD/YYYY') || ' ' ||
to_char(to_date(mod (tb1.dte_computation_on_data,86400) ,'sssss'),'hh24:mi:ss'),'MM/DD/YYYY hh24:mi:ss')
+ (EXTRACT(TIMEZONE_HOUR FROM SYSTIMESTAMP) / 24) as revert_test
, systimestamp as now
, tb1.dte_computation_on_data
from
( SELECT -- THIS IS THE FORMULA OF THE OLD FUNCTION THEY USE TO CONVERT DATE TO NUMBER AND INSERTED ON THE ROW
floor((CAST(SYS_EXTRACT_UTC(systimestamp) AS DATE) - TO_DATE('19700101', 'YYYYMMDD')) * 86400) dte_computation_on_data
FROM dual) tb1
)
/
REVERT NOW COMP DIFF
------------------- ------------------- ---------- ---------------------------
05/19/2011 10:01:09 05/19/2011 10:01:09 1305792069 +000000000 00:00:00.522953
Now, there's only the milliseconds left as difference.
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