Determine the discount period for a promissory note subject to the given terms. \begin{tabular}{|c|c|c|c|} \hline \begin{tabular}{c} Loan \\ Made on \end{tabular} & \begin{tabular}{c} Length of \\ Loan (Days) \end{tabular} & \begin{tabular}{c} Date of \\ Discount \end{tabular} & \begin{tabular}{c} Discount \\ Period (Days) \end{tabular} \\ \hline Aug. 9 & 45 & Aug. 21 & \\ \hline \end{tabular} Click the icon to view the Number of Each of the Days of the Year table. The discount period is $\square$ days.

Step 1 ：The discount period is the time between the date of discount and the due date of the loan. The due date of the loan can be calculated by adding the length of the loan to the date the loan was made. Once we have the due date, we can subtract the date of discount from it to get the discount period.

Step 2 ：In this case, the loan was made on August 9 and the length of the loan is 45 days. So, the due date of the loan is August 9 + 45 days. The date of discount is August 21. So, the discount period is (August 9 + 45 days) - August 21.

Step 3 ：We need to convert these dates into a format that can be used for calculations. Let's write the code to calculate the discount period.

Step 4 ：The code has correctly calculated the discount period as 33 days. This is the number of days between the date of discount (August 21) and the due date of the loan (September 23).

Step 5 ：Final Answer: The discount period is \( \boxed{33} \) days.