Output of who -m

Hi all,

I have two redhat boxes, the first one with:

Linux server1 2.6.9-55.ELsmp #1 SMP Fri Apr 20 16:36:54 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux

and the output of who -m is:

root     pts/2        Jun  7 08:41 (xxx.xxx.xxx.xxx)

in the second one:

Linux server2 2.6.32-431.el6.x86_64 #1 SMP Sun Nov 10 22:19:54 EST 2013 x86_64 x86_64 x86_64 GNU/Linux

and the output of who -m is:

root     pts/3        2016-06-07 09:09 (yyy.yyy.yyy.yyy)

why I have this different outputs?

How can I have the same output format from box1 on box2?

Anybody have faced similar situation?

Possibly a locale effect?

# LC_ALL=C who -m
user       pts/7        Jun  8 11:07 (xxxxxxxx)
# LC_ALL=en_US.UTF-8 who -m
user       pts/7        2016-06-08 11:07 (xxxxxxxx)