Set password for user user1

echo user1:passwd1 | chpasswd

And remove change password at first connection

echo user1:passwd1 | chpasswd -c

You can also remove the flag ADMCHG from /etc/security/passwd using

pwdadm -c user1

To check with particular user’s last password changed in AIX. Admin can check by execute following command

root@aix-server1:/etc/security# pwdadm -q user3
user3:
lastupdate = 1406597936

To determine when a password was last set or changed, as indicated in the last update value in pwdadm output. The UTC time stamp in seconds will need to be converted into a more meaningful current date time stamp.

root@aix-server1:/etc/security# perl -le ‘print scalar localtime 1406597936’
Tue Jul 29 09:38:56 2014