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_________ Oct 2017 _________
Week 1: 01
...
Week 4: 16 17 18 19 20 21 22
Week 5: 23 24 25 26 27 28 29
Week 6: 30 31

use warnings;
use strict;
...
    }
    print "\n";
}

________________________ 2017 ________________________
Week     Mon    Tue    Wed    Thu    Fri    Sat    Sun
...
  43      23     24     25     26     27     28     29   (Oct Week 5)
  44      30     31 Nov 01     02     03     04     05   (Nov Week 2, 
+Oct Week 6)
...

use warnings;
use strict;
...
    }
    print "   (".join(', ',sort keys %names),")\n";
}