" I try to make all my content relevant, but sometimes fail. Often, the status of a condition or situation as to permanance or on-going-ness is common knowledge, or obvious, and sometimes it's not known to the listener or reader (as in the case of your two examples). In my opinion, the writer is free to use whatever tense is appropriate to express his intention, as long as it doesn't present an impossible situation.
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Anonymous 1. Utterance: I am going to work tomorrow.
(at today's dinner table)
He said he (was??) is going to work tomorrow. He says/said he is/was going. (all four, except "He says he was . . . ")
2. Utterance: I will go to work tomorrow.
(at today's dinner table)
He said