[root@gb33 ~]# date
Sat Feb 18 13:54:44 CST 2017
[root@gb33 ~]# date -u
Sat Feb 18 05:54:49 UTC 2017
[root@gb33 ~]# date -R
Sat, 18 Feb 2017 13:54:52 +0800
[root@gb33 ~]# clock --show
Sat 18 Feb 2017 01:57:01 PM CST -0.807795 seconds