Link from the subnet utilization report to ip inventory report for each subnet with the same date range.

Netdisco/lib/App/Netdisco/Web/Plugin/Report/SubnetUtilization.pm

@@ -5,6 +5,7 @@ use Dancer::Plugin::DBIC;
 use Dancer::Plugin::Auth::Extensible;
 
 use App::Netdisco::Web::Plugin;
+use App::Netdisco::Util::Web (); # for interval_to_daterange
 
 register_report({
   category     => 'IP',
@@ -18,13 +19,16 @@ get '/ajax/content/report/subnets' => require_login sub {
     my $age = param('age') || '7 days';
     $age = '7 days' unless $age =~ m/^(?:\d+)\s+(?:day|week|month|year)s?$/;
 
+    my $daterange = App::Netdisco::Util::Web::interval_to_daterange($age);
+
     my $set = schema('netdisco')->resultset('Virtual::SubnetUtilization')
       ->search(undef,{
         bind => [ $subnet, $age, $age, $subnet, $age, $age ],
       });
 
     if ( request->is_ajax ) {
-        template 'ajax/report/subnets.tt', { results => $set, },
+        template 'ajax/report/subnets.tt',
+            { results => $set, daterange => $daterange },
             { layout => undef };
     }
     else {