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How to make a non root user to view the hardware time other than hwclock command in centos 7

My requirement is to make a non root user to view the time alone

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One could setup a sudo rule to allow the execution of hwclock without any arguments:

%sudo ALL=(ALL) NOPASSWD: /sbin/hwclock ""

Or grant read access to the RTC character device:

$ groups 
johnny sudo staff

$ sudo setfacl -m g:sudo:r /dev/rtc
$ /sbin/hwclock
Sun 18 Dec 2016 03:16:37 PM PST  -0.318689 seconds

This may have to be set after every reboot, as /dev is most likely volatile these days. I suppose an udev rule could handle this too.

In newer systemd-based systems, the timedatectl command is able to get the hardware clock w/o special permissions:

$ timedatectl | head -3
      Local time: Sun 2016-12-18 15:43:08 PST
  Universal time: Sun 2016-12-18 23:43:08 UTC
        RTC time: Sun 2016-12-18 23:43:08

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