so the first month of the year in this enterprise is October(10) and finish September (9)

( that's called CAMPAGNE its mean Crop year if i can trust Google translate 😀 )

@D_DEBUT = start_date

@D_FIN = end_date

date_complete : its a complete date ( DAY-MONTH-YEAR) = DATEID

Annee : year = ANNEE

trimestre : quarter of year = TRIMESTRE

mois : number of the month in the year calendar = MOIS

mois_complet : name of the month = LIB_MOIS

semaine_annee : number of the week in the year calendar = SEMAINE

jour : day = JOUR

jour_semaine : day of the week ( i think its the number of the day in a week ) = JOUR_SEMAINE

quinzaine : fifteen day in month ( month divided by 2 ) = QUINZAINE

campagne : campaign or crop year begin Oct and finish Sept = CAMPAGNE

annee2 : the year of the crop year ( in this format 12/13 yearbegin/yearfinish ) = ANNEE_CAMP

ordre_mois : the order of the months in the crop year 10 - 11 - 12 -1 ... = ORDRE_MOIS

in the end of the script hey put a concatenation with date complete with D1 D2 D3 every D is 10 day in the order

my internship supervisor is on vacation and i tried to expose the requirement so i hope its a apparent now for you