Hi there, Katy K. 

Let me make it up to you by ensuring you'll be able to show the service date on your invoices in QuickBooks Online (QBO). 

You can turn on the Service date option on the Account and settings page to add the column to your sales form.

 Here's how:

1. Go to the Gear icon and select Account and settings,
2. Click the Sales tab, then go to the Sales form content section.
3. Turn on the Service date option.
4. Click Save, then Done.

I also encourage you to visit this resource that will guide you in personalizing your sales forms: Customize invoices, estimates, and sales receipts in QuickBooks Online.

Keep your post coming if you need more help with adding service dates to invoices. I'll be around to help you always. Keep dafe!