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Don Burleson Blog 








ORA-01810: format code appears twice tips

Oracle Error Tips by Donald Burleson(S. Karam)


The Oracle docs note this on the ORA-01810 error:


ORA-01810 format code appears twice
Cause: A format code was listed twice in a date specification. Each format code may be specified only once in the function TO_DATE.
Action: Remove the duplicate format code from the date specification, then retry the operation.

NOTE: ORA-01810 does not exist on Oracle 10g per Oracle documentation

Oracle MOSC documents show that ORA-01810 is associated with a bug which has no current workarounds, although the following versions have been fixed: (Server Patch Set) (Server Patch Set) (Base Release)

Also on the MOSC was a problem with ORA-01810 in which a user was seeing ORA-01810 when they attempted to connect with SQL*PLUS version. 

The issue was resolved by an Oracle reply:

This is genrally because the client and server date formats are different.
Client is sending data in RRRR format while the database is expecting
only RR format.
1.Modify the NLS_DATE parameter in the registry.
2.Start the registry editor
Find the ORACLE key
4.Single click on it to populate the right-hand window
In the right-hand window, look for the value NLS_DATE (or NLS_DATE_FORMAT) and double click on it.
5. Change the value to read DD-MON-RR

If the value is not present add it by selecting Edit > New > key
Add the key with the above information.



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