What is oracle format for last .0 in TO_DATE ('2020-04-01 00:00:00.0','YYYY-MM-DD HH24:MI:SS.TZR')?

Question

I got this date from Java and is date type.

So trying to format it in oracle

select TO_DATE ('2020-04-01 00:00:00.0','YYYY-MM-DD HH24:MI:SS.TZR') from DUAL

not able to format last.0 in date. Tried various way

.TZR
  TZR

Not sure how to format that? If i remove.0 and.TZR then things work fine.

I am getting following error:

ORA-01820: format code cannot appear in date input format 01820. 00000 - "format code cannot appear in date input format"

Answer 1

The .0 is fractional seconds, not a timezone offset; but the date data type doesn't allow either anyway.

If your string always has .0 then you could treat that as fixed characters to ignore it:

select TO_DATE ('2020-04-01 00:00:00.0','YYYY-MM-DD HH24:MI:SS".0"') from DUAL;

TO_DATE('2020-04-01
-------------------
2020-04-01 00:00:00

If it might be non-zero or just if you prefer it can convert to a timestamp and then cast that to a date:

select CAST( TO_TIMESTAMP ('2020-04-01 00:00:00.0','YYYY-MM-DD HH24:MI:SS.FF') AS DATE) from DUAL;

CAST(TO_TIMESTAMP('
-------------------
2020-04-01 00:00:00

The FF format model element represents fractional seconds, and as the documentation says , that is "Valid in timestamp and interval formats, but not in DATE formats".

It isn't entirely cleat what getting the value from Java means, but if you're making a JDBC call and passing the parameter as a string you should step back and use the proper JDBC data type instead. Also note @Ole's comment about using a modern Java datatype if you can.

Answer 2

Such format can be easily converted by type info before

SELECT timestamp'2020-04-01 01:02:03.4' from DUAL

and to_timestamp can also be used in select stmt.