Hey there, Michelle. Welcome to the Community. 

In recording a deposit in QuickBooks Online (QBO), the Date and its transactions should based on your Bank statement. Since you've mentioned that the said transactions have a different year, you'll need to create two Bank Deposit. The first deposit consists of the previous year's transaction while the other deposit consists of the current year. 

Here's how: 

1. Go to the +New located at the upper left. 
2. In the Other column, click the Bank deposit option. 
3. Within the Bank deposit, fill out the necessary fields such as the Account, Date, Received From, Date, Type, Payment Method, and Amount. Ensure that the indicated date is the same as your bank statement. 
4. Once done, click Save and Close. 

If you happen to include the transactions in the wrong Bank deposit, you can untick it within the Chart of Accounts. Kindly follow these steps: 

1. Go to the Gear icon located in the upper right corner. 
2. Under the Your Company column, choose the Chart of Accounts.
3. Search the name of your account. 
4. Under the Action column, click the View register.
5. Choose the deposit transaction and press Edit. 
6. Untick the transaction that wasn't supposed to be there. 
7. Once done, click Save and Close. 

Since this matter involves recording your financial entries, I recommend contacting an accountant for more accurate data. 

You can also view this material to learn more about bank deposits: Record and make bank deposits in QuickBooks Online. 

Furthermore, you may want to learn how to reconcile your accounts so they always match your bank and credit card statements: Reconcile an account in QuickBooks Online. 

Kindly press the reply button if you need further assistance. We're always around to help.