No matter how many times I change the Placed In Service date for a Home Office it does not change, is there more than one place to change the date?

There should just be one field to change that date. If you are using Windows 10 and some buttons don't work or fields won't accept entry, this TurboTax FAQ has information that may help.

https://ttlc.intuit.com/replies/6549824

If you are using Turbo Tax Online, the most likely reason for buttons that don't work or not being able to enter information is that something in the web browser is not displaying the page properly.  The easiest way around this is to simply use a different web browser or clear the cache (directions below) in the current one.  You can select from Google Chrome, Mozilla Firefox, Internet Explorer or Safari.  If you need to install another browser, be sure to go to the trusted home site for the software for security reasons.

If you are using the Turbo Tax Phone App, then try opening Turbo Tax in the browser window on your phone.  It will use the same login information but may display the page better.

Below are directions from Microsoft on how to clear your cache/cookies/temporary internet files in Windows 7 and 8.

https://support.microsoft.com/en-us/help/260897/how-to-delete-the-contents-of-the-temporary-internet-files-folder