How to apply patch?

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[vondie]

How to apply the following patch?

----------------------------------------------------------------------
Index: ids.cgi
===================================================================
--- ids.cgi (revision 23991)
+++ ids.cgi (working copy)
@@ -245,14 +245,14 @@
     if (-e $conffile) {
         readhash($conffile, \%timeconf);
     }
- if ($conf->{'TIMEZONE'} =~ /^$/) {
+ if ($timeconf{'TIMEZONE'} =~ /^$/) {
         my %mainhash = ();
         my $mainconf = \%mainhash;
         readhash($mainsettings, $mainconf);
- $conf->{'TIMEZONE'} = $mainconf->{'TIMEZONE'};
- $conf->{'TIMEZONE'} =~ s+/usr/share/zoneinfo/(posix/)?++;
+ $timeconf{'TIMEZONE'} = $mainconf->{'TIMEZONE'};
+ $timeconf{'TIMEZONE'} =~ s+/usr/share/zoneinfo/(posix/)?++;
     }
- my $tz = DateTime::TimeZone->new( name => $conf->{'TIMEZONE'} );
+ my $tz = DateTime::TimeZone->new( name => $timeconf{'TIMEZONE'} );
     $dt->set_time_zone($tz);
     return $dt->strftime("%d.%m.%Y, %H:%M:%S");
 }