crash reporter: add creation time for reference

(cherry picked from commit 2cacc4b5)

src/www/crash_reporter.php

@@ -63,14 +63,15 @@ include('head.inc');
 
 $last_version = '/usr/local/opnsense/version/opnsense.last';
 $crash_report_header = sprintf(
-    "%s\n%s %s%s %s (%s)\nUUID %s\n",
+    "%s\n%s %s%s %s (%s)\nUUID %s\nTime %s\n",
     php_uname('v'),
     $g['product_name'],
     trim(file_get_contents('/usr/local/opnsense/version/opnsense')),
     file_exists($last_version) ? sprintf(' [%s]', trim(file_get_contents($last_version))) : '',
     trim(shell_exec('/usr/local/bin/openssl version')),
     php_uname('m'),
-    shell_exec('/sbin/sysctl -b kern.hostuuid')
+    shell_exec('/sbin/sysctl -b kern.hostuuid'),
+    date('r')
 );
 
 if (isset($_SERVER['HTTP_USER_AGENT'])) {