[ddekok]

I just tried this on my system and it works. This may be due to the fact I use blowfish for my password format.

The default class from /etc/login.conf
Note that only passwd_format and and passwordtime have been changed.

default:\
	:passwd_format=blf:\
	:passwordtime=60d:\
	:copyright=/etc/COPYRIGHT:\
	:welcome=/etc/motd:\
	:setenv=MAIL=/var/mail/$,BLOCKSIZE=K,FTP_PASSIVE_MODE=YES:\
	:path=/sbin /bin /usr/sbin /usr/bin /usr/games /usr/local/sbin /usr/local/bin /usr/X11R6/bin ~/bin:\
	:nologin=/var/run/nologin:\
	:cputime=unlimited:\
	:datasize=unlimited:\
	:stacksize=unlimited:\
	:memorylocked=unlimited:\
	:memoryuse=unlimited:\
	:filesize=unlimited:\
	:coredumpsize=unlimited:\
	:openfiles=unlimited:\
	:maxproc=unlimited:\
	:sbsize=unlimited:\
	:vmemoryuse=unlimited:\
	:priority=0:\
	:ignoretime@:\
	:umask=022:

Rebuild the login.conf database and update your password.

# cap_mkdb /etc/login.conf
% passwd

Then, to test the expiration, change the password expiration on your account

# pw usermod YOU -p 10-11-2008

Logout and then log back in. Hopefully you will be prompted to enter a new password.

I am assuming it is my passwd_format selection that allows me to do this. After I ran the above commands, I did see a timestamp in the password field of my user in /etc/master.passwd, and `date -r blah` confirmed it was the same date I set my password expiration to.