I’m going to guess it’s because Wednesday, Dec 31 1969 (which is Jan. 1 1970 + 1000 milliseconds, adjusted for your time zone) was not during Daylight Savings Time, whereas Sat Aug 13 is. Since Daylight Savings Time does not apply to UTC, the timezone offset changes for dates that are in DST for your locale.
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this might be what I'm going for -- show the originating "local" time for a timestamp, along with the UTC offset.