You can do this to get the creation date.
DSPOBJD OBJ(*ALL) OBJTYPE(*USRPRF) DETAIL(*FULL) OUTPUT(*OUTFILE) OUTFILE(yourlib/yourfile)
If you want everything in one file, then also do this:
DSPUSRPRF USRPRF(*ALL) TYPE(*BASIC) OUTPUT(*OUTFILE) OUTFILE(yourlib/yourfile2)
Now with Query, SQL, a joinfile, or what every you want to use, you can get it all together in one report.