
First day with week numbers
      January 0001     
   Su Mo Tu We Th Fr Sa
 1                   [7m 1[27m
 2  2  3  4  5  6  7  8
 3  9 10 11 12 13 14 15
 4 16 17 18 19 20 21 22
 5 23 24 25 26 27 28 29
 6 30 31               
Reformation corner cases 1 with week numbers
     September 1752    
   Su Mo Tu We Th Fr Sa
36        1 [7m 2[27m 14 15 16
37 17 18 19 20 21 22 23
38 24 25 26 27 28 29 30
                       
                       
                       
Reformation corner cases 2 with week numbers
     September 1752    
   Su Mo Tu We Th Fr Sa
36        1  2 14 15 16
37 17 18 19 20 21 22 23
38 24 25 26 27 28 29 30
                       
                       
                       
Reformation corner cases 3 with week numbers
     September 1752    
   Su Mo Tu We Th Fr Sa
36        1  2 14 15 16
37 17 18 19 20 21 22 23
38 24 25 26 27 28 29 30
                       
                       
                       
Reformation corner cases 4 with week numbers
     September 1752    
   Su Mo Tu We Th Fr Sa
36        1  2 [7m14[27m 15 16
37 17 18 19 20 21 22 23
38 24 25 26 27 28 29 30
                       
                       
                       
Last day with week numbers
     November 9999            December 9999            January 10000     
   Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa     Su Mo Tu We Th Fr Sa
45     1  2  3  4  5  6  49           1  2  3  4   1                    1
46  7  8  9 10 11 12 13  50  5  6  7  8  9 10 11   2  2  3  4  5  6  7  8
47 14 15 16 17 18 19 20  51 12 13 14 15 16 17 18   3  9 10 11 12 13 14 15
48 21 22 23 24 25 26 27  52 19 20 21 22 23 24 25   4 16 17 18 19 20 21 22
49 28 29 30              53 26 27 28 29 30 [7m31[27m      5 23 24 25 26 27 28 29
                                                   6 30 31