I'd be glad to answer why the service entries doesn't have a date column in QuickBooks Self-Employed (QBSE), @finance159. However, I need more detailed information to understand your concerns better.
May I know what are you referring with the service entries and which area is located in your QBSE account? A screenshot will be a great help for visual reference and understanding your query better.
The invoice Date column is available to know when you created the invoice and it also includes date column when the invoice is due.
Additionally, if you referring with service entries located in the Transactions page which you're unable to see the date column, I recommend performing the basic browser troubleshooting steps to isolate the issue. It also helps to improve and speed up your browser's performance.
First, you'll want to restart your browser. Then, try updating your bank in an incognito or private browser. You can use these keyboard shortcuts to launch a new private window:
Google Chrome: press Ctrl + Shift + N
Mozilla Firefox: press Ctrl + Shift + P
Safari: press Command + Shift +If
it works on the private browser, go back to the regular browser and clear your browser's cache. Then, see if the Date column is visible.

Moreover, if you're referring with the service entries in the Invoice page, then the option to add the Date column is unavailable and it's working as designed.

I'm adding this article for more details in handling invoices in QBSE: Create invoices in QuickBooks Self-Employed.
Furthermore, I've attached this article for future reference in categorizing your transactions in QBSE to ensure the accuracy of your books: Categorize transactions in QuickBooks Self-Employed.
Feel free to post a reply in this thread for additional information and clarification. I'm always here to assist you.