[root@superdssbox999 ~]# date

Tue May 31 15:10:47 BRT 2016

[root@superdssbox999 ~]# date -d"last month"

Sun May  1 15:10:52 BRT 2016

[root@superdssbox999 ~]# date -d"last day last month"

Sat Apr 30 15:10:54 BRT 2016

[root@superdssbox999 ~]#

Atte.

Felippe Silvestre