Again, I can't follow this because I don't recall the definition of model A. But here's a fundamental difference between a timezone-aware datetime and a POSIX stamp (apart from epoch, range and precision). The difference applies only to "political" timezones, which may change offsets or DST rules. The difference is that an aware datetime says "in timezone Z, when the local clock says T". If T is in the future, politicians may change the mapping of T to UTC in Z. However, politics can't change the meaning of a POSIX timestamp. Even for T in the (distant) past the mapping may still change, when research finds that the rules for Z were different at some year in the past than they were presumed. So, to me, an aware datetime *fundamentally* differs from a POSIX timestamp, and even from a pair composed of a POSIX timestamp plus a tzinfo object. (POSIX timestamps are however embeddable in datetimes by using a fixed-offset tzinfo.)
-- --Guido van Rossum (python.org/~guido)
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