tests/expected/cal/vertical-3mjv

   1 Julian - Monday-based week
   2      December 2017            January 2018             February 2018
   3 Mon     338 345 352 359        1   8  15  22  29           36  43  50  57
   4 Tue     339 346 353 360        2   9  16  23  30           37  44  51  58
   5 Wed     340 347 354 361        3  10  17  24  31           38  45  52  59
   6 Thu     341 348 355 362        4  11  18  25           32  39  46  53
   7 Fri 335 342 349 356 363        5  12  19  26           33  40  47  54
   8 Sat 336 343 350 357 364        6  13  20  27           34  41  48  55
   9 Sun 337 344 351 358 365        7  14  21  28           35  42  49  56