the REAL output for 30 4 2002 is

mon   1    8   15   22   29
tue   2    9   16   23  [30]
wed   3   10   17   24
thu   4   11   18   25
fri   5   12   19   26
sat   6   13   20   27
sun   7   14   21   28

"for a reading convenience spaces in output example are replaced with
dots, real output file should contain spaces instead."

idiot me! :)