The UC application window has been extended to transfer students until January 3. This means you have not only the month of November but all the way up until Jan 3 to apply.
However, before you jump for joy, I want to urge you NOT to extend your online submission until December or January, unless you have no alternative. The fine print in the notice mentions that some departments and majors will start working on filling up their coffers right after the standard Nov 30 deadline, so late applicants risk getting left out in the cold. (The UC also plans to list majors that are closed to the extension illogically on Dec 1, after the standard deadline is over, meaning you won’t know if your major is ineligible until it’s too late.)
Last year there was a similar extension that happened after the November application window closed. The UC got a lot of flack for it because the regular applicants who applied by Nov 30 felt cheated when suddenly more time was given after it was too late for them. This is why, I assume, the UC is announcing it earlier. However, it really does no good announcing it early if they have no idea what majors will be part of the extension.
This is why I urge all transfer applicants to ignore the extension and get the application in by November 30. To save your sanity, I also suggest you get it submitted by November 29 in case there is a server crunch on the 30th, leading to a mild freak out.
For those interested in seeing what majors are available after December 1, here is the link. If an unforseen event occurs and you are submitting after November 30, you may need to make adjustments should your major not be listed.