If it's a Unix timestamp it looks a bit screwed up. I'd have thought it should maybe be 1565607390.550 (stamp in milliseconds so divide by 1,000) but that returns 12/08/2019 10:56:31 so not quite right.
The Excel formula is normally
=A1/86400+25569
with A1 being your timestamp
That's much closer though. I've been struggling to convert using that formula. Shown Date = 13 Aug 12:36 Unix = 1565607390550
Doing the Unix / 1000 / 86400 + 25569 also gives me 12 Aug 10:56
So, just over a day out.
It's not a weird time zone is it? (Although I can't really see how you'd get such a large difference from time zone.)
Do you have multiple dates? Is the difference always the same?
@moocher started
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If it's a Unix timestamp it looks a bit screwed up. I'd have thought it should maybe be
1565607390.550 (stamp in milliseconds so divide by 1,000) but that returns 12/08/2019 10:56:31 so not quite right.
The Excel formula is normally
with A1 being your timestamp