You cannot asign a scalar value as a input for that object and also not posible to convert the string to an array by giving "[ ]" symbols. But you can give array as a input as shown below:

use Date::Calc::Iterator;

  # This puts all the dates from Dec 1, 2003 to Dec 10, 2003 in @dates
+1
  # @dates1 will contain ([2003,12,1],[2003,12,2] ... [2003,12,10]) ;
    my @sr = (2005,07,1);
  my $i1 = Date::Calc::Iterator->new(from => [@sr], to => [2005,10,1])
+;
  my @dates1 ;
  push @dates1, $_ while $_ = $i1->next ; 

foreach my $v (@dates1) {
print "@$v\n";
}
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Regards,
Velusamy R.