Gregorian - Monday-based 3 months with weeks
  November 2147483646      December 2147483646       January 2147483647  
   Mo Tu We Th Fr Sa Su     Mo Tu We Th Fr Sa Su     Mo Tu We Th Fr Sa Su
44           1  2  3  4  48                 1  2   1     1  2  3  4  5  6
45  5  6  7  8  9 10 11  49  3  4  5  6  7  8  9   2  7  8  9 10 11 12 13
46 12 13 14 15 16 17 18  50 10 11 12 13 14 15 16   3 14 15 16 17 18 19 20
47 19 20 21 22 23 24 25  51 17 18 19 20 21 22 23   4 21 22 23 24 25 26 27
48 26 27 28 29 30        52 24 25 26 27 28 29 30   5 28 29 30 31         
                          1 31