I tested some values by starting from zero unix time and saw that it always can only go forward, because it always has to be greater than the median time of the last 11 blocks. But I have another time-related question: will the chain be halted when reaching median time equal to 0xffffffff? Or maybe we have some kind of overflow bug here, as it was in Value Overflow Incident, but time-related, so is it possible to jump back from 0xffffffff to 0x00000000?