I recently installed 14.04, and decided to do so as a fresh install.
I wiped the only Ubuntu installation on the system, left a Windows 7 installation on, and installed over mdadm (once with /boot on mdadm and later with it not on mdadm as that saves a few other headaches. I'm pretty sure what I'm describing happened in both cases).
Everything from previous Ubuntu installations were completely wiped by manual formatting of the relevant partitions.
I'm in a time-zone currently on Irish Summer Time (UTC+01:00). Windows started jumping the time an hour ahead.
Now, I might expect a default Windows installation to jump the time an hour back, thinking the UTC bios time was the local time, but this was an hour ahead and I had
RealTimeIsUniversal set in the registry to get some saner behaviour out of Windows.
After some puzzling over this, I realised that in /etc/default/rcS there was the line
UTC=no to set Ubuntu onto local time rather than the normal
This is a well-known setting for people who normally only use Windows as the illogical choice of local time (not unambiguous) means less change for them than fixing Windows in a way that MS don't support, but I certainly didn't set it.
This was easily fixed, but as I don't know what broke it, I don't know that it won't be broken again.
Is there anything that sets
UTC=no upon use or installation, and if so can that be blocked?