MyBB Internal Error

MyBB has experienced an internal error and cannot continue.

Error Type:
(8192)
Error Message:
mktime(): The is_dst parameter is deprecated
Location:
File: inc/functions_time.php
Line: 230
Code:
227.     } else {
228.         if (isset($TZ)) return $TZ;
229.         $y date('Y');
230.         $TZ mktime(0,0,0,12,2,$y,0) - gmmktime(0,0,0,12,2,$y,0);
231.     }
232.     
233.     
return $TZ
Backtrace:
File Line Function
/inc/class_error.php 164 errorHandler->output_error
[PHP]   errorHandler->error
/inc/functions_time.php 230 mktime
/inc/functions_time.php 686 adodb_get_gmt_diff
/member.php 1294 adodb_mktime