Cached file '...' has a future timestamp

Hi,

I get tones of these messages, everytime the purge process runs. Why they
are triggered?

# grep -Fc 'has a future timestamp' /var/log/daemon.log
38665
# grep -F 'has a future timestamp' /var/log/daemon.log S -n '1p; $p'
Jan 11 07:46:14 alea wwwoffled[6975]: Cached file 'http/www.weibeldruck.c=
h/UpXZuf-PUImJmdwQqpOVkZA' has a future timestamp; changing timestamp.
Jan 11 09:23:26 alea wwwoffled[6975]: Cached file 'ftp/ftp.de.debian.org/=
UJyiy5o+zKfj1LVtkioKj+g' has a future timestamp; changing timestamp.

Bye, J=C3=B6rg.
--=20
chinesiches Sprichwort:
Wer fragt, ist ein Narr f=C3=BCr f=C3=BCnf Minuten.
Wer nicht fragt, ist ein Narr f=C3=BCrs ganze Leben.