Does anyone know how to set the time to GMT so that it shows the correct time on QB when transactions and invoices are set etc ?

Hello @sarah84,

The date and time in QuickBooks are generated through our server. Thus, changing it is unavailable.

I can send a product request to our engineers in your behalf. They can consider this option in the future update. You can also visit our blog to know  

Please know that you're always welcome to swing by anytime if you have other questions or concerns. The Community is here to help. Thanks for posting and be safe.