month was new new
----- --- --- ---
0     -1  -1  -1
1     -1  -1  -1
2     0   0   0
3     0   0   0
4     0   0   0
5     0   0   0
6     0   0   0
7     0   0   0
8     0   0   0
9     0   0   0
10    0   0   0
11    0   0   0
12    -1  0   0
13    -1  0   0
14    0   1   1
15    0   1   1
16    0   1   1
17    0   1   1
18    0   1   1
19    0   1   1
20    0   1   1
21    0   1   1
22    0   1   1
23    0   1   1