Guys/Brett,
I have just built my HAH (306 build), and have been playing. When I got around to googlecal I was up and runing right away.
Then, I noticed that the GUI was reporting date/time @ UTC, so I went ahead and changed /etc/TZ to GMT0BST-1 as we are now in BST (i will add the changeover dates/times later and retest). This fixed my time in the O/S and GUI and my HAH now reports the UK date/time.
Anyhow - my googlecal stopped working (as it should have worked).