pam_unix: password changing time

Hello!

Since a new server-installation, for which I used a numer of configuration files from an older server, there are messages like this in /var/log/auth.log :

Jul 11 06:25:01 area51 su[7884]: (pam_unix) account nobody has password changed in future

stat for /etc/passwd, /etc/passwd-, /etc/shadow and etc/shadow- returns correct timestamps in the past.

Does anybody know, where the timestamp for a password changing is located and how to change it?

Kind Regards
Matthias Faulstich

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