My displayed time was out one hour after a 'simple' install of RC2 from a live DVD.
I'm not sure if my system clock was out but the clock plugin and the 'last amended' time on edited files were both out.

In the end i fixed it using

$ sudo dpkg-reconfigure tzdata

Using the arrow keys I selected the correct region and city.
It confirmed the changed timezone and the clock plugin updated at the start of the next minute.

I don't think I was asked for either locale or timezone by the RC2 'simple' installer and I had to repair both which took some time to read up on. Might be worth RC3 prompting for selection of both as I found it quite difficult to fix both these settings after the event. I think the installer must have asked for a language for which I would have selected English but I ended up with en-US when I needed en-GB and I have no idea how it selected my timezone but it wasn't quite right.

I soon sorted it out though and am really happy with Devuan.

For anyone interested in correcting the locale settings:

enter

$ locale

It probably says en_US

make sure that debconf package is installed.
Then enter

$ sudo dpkg-reconfigure locales

You'll see a long list of locales, and you can navigate that list with the up/down arrow keys.
Pressing the space bar toggles the locale under the cursor.
Make sure to select at least one UTF-8 locale.
Tab out of list and press return on OK button.
The final question of dpkg-reconfigure locales is to select the default locale.
Use arrows to choose and then press return.
Changes take effect after a reboot

I also then had to run this command to replace the $locale 'C' settings (which behaved like en-US) with my regional settings:

$ sudo update-locale LC_ALL=en_GB.UTF-8 LANG=en_GB.UTF-8

Log in again, or else you won't see the changes.