adjust age closing data produksi

internal/modules/closings/dto/closing.dto.go

@@ -204,3 +204,20 @@ func ToClosingDetailDTO(e entity.ProjectFlock) ClosingDetailDTO {
 		ClosingListDTO: ToClosingListDTO(e),
 	}
 }
+
+func CalculateAgeFromChickinDataProduksi(projectFlockKandang *entity.ProjectFlockKandang, deliveryDate *time.Time) int {
+	if projectFlockKandang == nil || deliveryDate == nil || len(projectFlockKandang.Chickins) == 0 {
+		return 0
+	}
+
+	earliestChickinDate := projectFlockKandang.Chickins[0].ChickInDate
+	for _, chickin := range projectFlockKandang.Chickins {
+		if chickin.ChickInDate.Before(earliestChickinDate) {
+			earliestChickinDate = chickin.ChickInDate
+		}
+	}
+
+	ageInDays := int(deliveryDate.Sub(earliestChickinDate).Hours() / 24)
+	ageInWeeks := ageInDays / 7
+	return ageInWeeks
+}