ps says process has been running for 49710 days

[Kelly Jones]

I use "/bin/ps -www -ax -eo 'pid etime args'" to see how long a
process has been running. This usually works fine, but I sometimes see
things like:

17469 49710-06:28:15 /usr/bin/fly -q -i [...]

indicating a process has been running for 49710+ days.

I originally thought that was the time from the Unix epoch, but it's
actually near 13 Dec 1901.

I can easily workaround this, but was curious if anyone knew more about it?

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