Well, I've never used a "change" command in Linux, bit this is easy enough to script, the dates in /etc/shadow are the number of days since the beginning of Unix time, so you can convert to Unix time by multiplying by 86400 and formatting the output. In perl, "print scalar(localtime(00000000))" or some such.
To modify /etc/shadow, usermod is the Solaris equiv. See man usermod.