PL/SQL :: Making Sql To Only Return Last 12 Months From Date?

i have written an sql to look as sales orders but i want it to only return the last 12 months worth of sales for the date its run, the date file [sdtrdj] is julian date so i used to_char to conver it to dd-mm-yyyy how can i get it to only return the last 12 months from the date its run

select
sdshan As "Location", sddcto As "Order Type", sddoco As "Order Number",sdlitm As "Product Code", sddsc1 As "Product Description",
to_char(to_date(sdtrdj + 1900000, 'yyyyddd'),'DD-MM-YY')As "Order Date", sduorg As "Order Qty", sdaexp As "Extended Amount", sdsoqs As "Quantity Shipped",
ibsrp4 As "Srp4", ibsrp6 As "Srp6", ibsrp7 As "srp7", ibsrp9 As "Srp9", ibsrp0 As "srp10", sdsrp2 As "Franchise"
From proddta.f4211, proddta.f4102
Where sdmcu = ' UKC001'
and sddcto = 'KO'
and sdlitm = iblitm and sdmcu = ibmcu
and sdsrp2 In ('504','973','322','236','232','856','233','566','590','470','343','266','279')