SKS-Keyserver returns negative timestamp

[Jan Girlich]

Hi,

I am doing a request to an SKS keyserver (sks.pgpkeys.eu) and receive
the following response:

'pub:AC71EF0964192842B15AFE6417EDE60510000001:0:0:-62135596800::'

How is the timestamp '-62135596800' to be interpreted?

I looked up the RFC for the HKP and it states quite clearly, that this
field should be seconds since 01.01.1970:

https://datatracker.ietf.org/doc/html/draft-shaw-openpgp-hkp-00#section-5.2

Respectively:

https://datatracker.ietf.org/doc/html/rfc2440#section-3.5

How come the SKS server returns a negative timestamp then?

Cheers,
Jan