[tz] Old timestamps on files

[Clive D.W. Feather]

Garrett Wollman said:
>>> I also have a number of files dated 1980-01-01 with a range of times, but I'm
>>> a bit more suspicious about them.

> 1980-01-01 is the (PC|MS)-DOS epoch. Early PCs did not have a battery backed clock, and so every boot would require manually setting the clock -- and many people did not bother to do so, hence timestamps of that date are not to be trusted.

That would explain those, yes.

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