@kaia cal --version
cal from util-linux 2.40.2

Hmm.

For me it's; `gcal Jan 25`

As after all; `gcal --version`
gcal (GNU cal) 4.1
Copyright (c) 1994, 95, 96, 1997, 2000 Thomas Esken
Copyright (c) 2010, 2011, 2012, 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty, without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.