in fact localtime is correct if server admin runs server in GMT

Revert "#441 change localtime to gmtime"

This reverts commit 779e0a618d.

lib/App/Netdisco/Util/Graph.pm

@@ -62,7 +62,7 @@ Creates netmap of network.
 sub graph {
     my %CONFIG = %{ setting('graph') };
 
-    my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = gmtime();
+    my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime();
     my $month = sprintf("%d%02d",$year+1900,$mon+1);
 
     info "graph() - Creating Graphs";

lib/App/Netdisco/Util/Statistics.pm

@@ -3,7 +3,7 @@ package App::Netdisco::Util::Statistics;
 use Dancer qw/:syntax :script/;
 use Dancer::Plugin::DBIC 'schema';
 
-use Time::Piece; # for OO gmtime
+use Time::Piece; # for OO localtime
 
 use base 'Exporter';
 our @EXPORT = ();
@@ -40,7 +40,7 @@ sub update_stats {
 
   $schema->txn_do(sub {
     $schema->resultset('Statistics')->update_or_create({
-      day => gmtime->ymd,
+      day => localtime->ymd,
 
       device_count =>
         $schema->resultset('Device')->count_rs->as_query,