Rules and Regulations

I hate to be a stickler for rules. Vampires have guild lines they must follow, for instance they are deeply offended by a cross, another rule you can not see them in a mirror, they are allergic to garlic and/or sunshine, and the there are more regulations they strictly adhere to.

And the same about Werewolves. They have their rules and regulations also. One is if you shoot one with a silver bullet it will kill them. Another one is that they only sprout hair and turn into werewolves during a full moon.

And I think this transformation happens at midnight. Now, this is what I am wondering about: If the midnight rule applies what happens when Daylight Savings time shifts the time an hour? Do they go by the old time or the Daylight time. I know it is just a technicality but still, it would be nice to know.