thank's a lot for the time spent to share your knowledge. If I good understand no need to split the line to create fields already existing, (I 've only put the raw because it's sometimes easier) : DAT_DER_IMAP, DAT_DER_POP, DAT_DER_WEB are the names of the fields.
| foreach DAT_DER_* [ eval <<FIELD>>=if('<<FIELD>>'="NULL",0,strptime(<<FIELD>>, "%Y%m%d")) ]
| eval correct_date=strftime(if(first_field >= second_field, if(first_field >= third_field, first_field, if (second_field >= third_field, second_field, third_field)), second_field), "%Y%m%d")
| table login_forgee correct_date datecrea
no error, but the "correct_date" column is empty
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