Hi there, josephllc.

Good to see you here in QuickBooks Community. Allow me help and to provide some insights about the time format in QuickBooks Online. 

The data QuickBooks receives depends on how TeamWork.com (TW) shares the information with us. Each application uses different platforms that might work differently.

In order to get this corrected, I would recommend getting in touch with the TeamWork.com Support to know more about how it integrates with other software like QuickBooks. They might have workarounds they can provide to help you update your invoice time format.

Please know that you're always welcome to drop by if you have any other concerns. Have a great day.