Uc berkeley class times

<p>Hello!
I've been checking out the times for the UC Berkeley classes that I'm interested and noticed that some of the classes I'm interested in start and end at the same time. For example, one class is from 1-230 and the second class is from 230-4. Do professors allow 5-10 minutes grace period or does this mean we shouldn't enroll in both classes and must choose one of them?</p>

<p>There is a thing called Berkeley time. All classes start 10 min after the listed start time. So your second class would start at 2:40.</p>