After selecting a batch of bills that I want to print checks, I want to change the check date to today. How can I either change the check date or deselect all invoices

Go to Edit menu > Preferences, Checking preferences, the Company preferences tab.

Checkmark the box for "Change Check Date when Non-Cleared check is Printed."

Now they will show Printed Date by default.

Is there a way to do this with quickbooks online? I am not finding checking preferences under account and settings. There is not an edit menu in QB online. Under accounts and settings, there's company, expenses, etc but nothing about checking preferences. 

That specific functionality is available in QuickBooks Desktop only, Lgepford.

In QuickBooks Online, you'll have to manually change the bill payment (check) date. Here's how:

1. Open the bill payment.
2. Change the Payment date.
3. Click Save and close. 

If you have a lot of checks to edit, you can pull them up, and change them one by one. Here's how:

1. Click the Magnifying Glass icon.
2. Select Advanced Search.
3. Click the Search drop-down arrow, then select Bill Payments.

Just follow the steps above on how to manually change the check date. 

I'm just around if you need more help. Just tag me and I'll get back to you as soon as I can.