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ORA-01843: not a valid month tips

Oracle Error Tips by Burleson Consulting (S. Karam)

 

The Oracle docs note this on the ora-01843 error:

ORA-01843 not a valid month
 
Cause: A date specified an invalid month. Valid months are: January-December, for format code MONTH, and Jan-Dec, for format code MON.
 
Action: Enter a valid month value in the correct format.

Oracle MOSC has an outstanding documentation regarding resolving ORA-01843.  The reason ORA-01843 occurs

  • using wrong DD/MM sequence / incorrect NLS_DATE_FORMAT
    This happens a lot when you see data coming from US
    (where the Month is normally written before the day)
    but the format in the application is still the "european" style.
    (where the day is written before the month)
    or inverse of course
  • using a different Language with the MON mask,
    which can be much harder to spot.
  • using a complete incorrect NLS_DATE_FORMAT:
    Such as trying to insert a "written" month name but are using a "numeric"
    month in the mask

The same documentation also informs that, "ORA-01843: not a valid month is not a "oracle problem" but most likely caused by not defining proper date masks in your code or relying on incorrectly assumed defaults."

Also important is to keep in mind that ORA-01843 is not always thrown, even when there is incorrect data.

(You may want to view the rest of this MOSC (Doc ID: Note:338832.1) documentation for full information regarding ORA-01843 debugging.)


 

 

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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