[Bug 1747076] [NEW] Cal ignores LC_ALL=en_GB.utf8 and starts week on Sunday

[Toni Kunic]

Public bug reported:

Ubuntu 16.04.3 LTS, and Ubuntu 17.10.

16.04$ apt-cache policy bsdmainutils
bsdmainutils:
  Installed: 9.0.6ubuntu3
  Candidate: 9.0.6ubuntu3
  Version table:
 *** 9.0.6ubuntu3 500
        500 http://ca.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

17.10$ apt-cache policy bsdmainutils
bsdmainutils:
  Installed: 9.0.12+nmu1ubuntu1
  Candidate: 9.0.12+nmu1ubuntu1
  Version table:
 *** 9.0.12+nmu1ubuntu1 500
        500 http://ca.archive.ubuntu.com/ubuntu artful/main amd64 Packages
        100 /var/lib/dpkg/status

====================

Expected: With the en_GB.utf8 locale, cal should start on Monday.

====================

Observed behaviour: cal fails to observe locale, always starting weeks
on Sunday.

$ LC_ALL=en_GB.utf8 cal
   February 2018      
Su Mo Tu We Th Fr Sa  
             1  2  3  
 4  5  6  7  8  9 10  
11 12 13 14 15 16 17  
18 19 20 21 22 23 24  
25 26 27 28           
                

$ LC_ALL=en_US.utf8 cal
   February 2018      
Su Mo Tu We Th Fr Sa  
             1  2  3  
 4  5  6  7  8  9 10  
11 12 13 14 15 16 17  
18 19 20 21 22 23 24  
25 26 27 28           
          
====================

For comparison, ncal behaves correctly:

$ LC_ALL=en_GB.utf8 ncal
    February 2018     
Mo     5 12 19 26   
Tu     6 13 20 27   
We     7 14 21 28   
Th  1  8 15 22      
Fr  2  9 16 23      
Sa  3 10 17 24      
Su  4 11 18 25  


$ LC_ALL=en_US.utf8 ncal
    February 2018     
Su     4 11 18 25   
Mo     5 12 19 26   
Tu     6 13 20 27   
We     7 14 21 28   
Th  1  8 15 22      
Fr  2  9 16 23      
Sa  3 10 17 24

** Affects: bsdmainutils (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1747076

Title:
  Cal ignores LC_ALL=en_GB.utf8 and starts week on Sunday

Status in bsdmainutils package in Ubuntu:
  New

Bug description:
  Ubuntu 16.04.3 LTS, and Ubuntu 17.10.

  16.04$ apt-cache policy bsdmainutils
  bsdmainutils:
    Installed: 9.0.6ubuntu3
    Candidate: 9.0.6ubuntu3
    Version table:
   *** 9.0.6ubuntu3 500
          500 http://ca.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

  17.10$ apt-cache policy bsdmainutils
  bsdmainutils:
    Installed: 9.0.12+nmu1ubuntu1
    Candidate: 9.0.12+nmu1ubuntu1
    Version table:
   *** 9.0.12+nmu1ubuntu1 500
          500 http://ca.archive.ubuntu.com/ubuntu artful/main amd64 Packages
          100 /var/lib/dpkg/status

  ====================

  Expected: With the en_GB.utf8 locale, cal should start on Monday.

  ====================

  Observed behaviour: cal fails to observe locale, always starting weeks
  on Sunday.

  $ LC_ALL=en_GB.utf8 cal
     February 2018      
  Su Mo Tu We Th Fr Sa  
               1  2  3  
   4  5  6  7  8  9 10  
  11 12 13 14 15 16 17  
  18 19 20 21 22 23 24  
  25 26 27 28           
                  

  $ LC_ALL=en_US.utf8 cal
     February 2018      
  Su Mo Tu We Th Fr Sa  
               1  2  3  
   4  5  6  7  8  9 10  
  11 12 13 14 15 16 17  
  18 19 20 21 22 23 24  
  25 26 27 28           
            
  ====================

  For comparison, ncal behaves correctly:

  $ LC_ALL=en_GB.utf8 ncal
      February 2018     
  Mo     5 12 19 26   
  Tu     6 13 20 27   
  We     7 14 21 28   
  Th  1  8 15 22      
  Fr  2  9 16 23      
  Sa  3 10 17 24      
  Su  4 11 18 25  

  
  $ LC_ALL=en_US.utf8 ncal
      February 2018     
  Su     4 11 18 25   
  Mo     5 12 19 26   
  Tu     6 13 20 27   
  We     7 14 21 28   
  Th  1  8 15 22      
  Fr  2  9 16 23      
  Sa  3 10 17 24

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