Julian    - Monday-based month with weeks
      December 2147483646     
   Mon Tue Wed Thu Fri Sat Sun
48                     335 336
49 337 338 339 340 341 342 343
50 344 345 346 347 348 349 350
51 351 352 353 354 355 356 357
52 358 359 360 361 362 363 364
 1 365