50 lb Bags:

The Julian date is the 4 digit number located on the side of the bag. 

5 LB BAGS:

The Julian date is located on the top of the bag. Look for 4 digits next to the best date.

 
Bag-for-Julian-date.jpg
 
Bag-for-Best-Before.jpg
 

Step 1:

Click the first digit in the number sequence shown above: (in the 50 lb bag example, that number is 8)

 

Step 2:

In the drop down, click the number indicated on your flour bag.