Therefore, if a B-theoretic subject S knows (at more than one time) what time it is, then they undergo changes. The reason is that how they believe what they believe changes. They need to keep track of their temporal perspective by having appropriately varied tensed beliefs (“it’s noon”, “it’s 12:01”). At least this is so for anyone whose temporal nature relevantly resembles our own. Does this group include God? If so, then on the B-theory too, there is reason to worry about the combination of omniscience with timelessness.