function change_location() {

    // set the timezone
    date_default_timezone_set( get_option( 'timezone_string' ) );

    // get the values
    $user_id            = get_current_user_id();
    $current_time       = strtotime( 'now' );
    $is_weekend         = ( (date( 'N', strtotime( 'tomorrow' ) ) > 5) ? 1 : 0 );

    // setting config
    $use_tasks          = get_option( 'mb_use_tasks' );

    // default - if blank fields
    $default_start      = strtotime( 'today 9:00 am' );
    $default_finish     = strtotime( 'today 5:00 pm' );
    $default_lunch_in   = strtotime( 'today 1:00 pm' );
    $default_lunch_out  = strtotime( 'today 2:00 pm' );
    $next_midnight      = strtotime( 'tomorrow 12:00 am' );

    // user meta
    $user_start         = get_user_meta( $user_id, 'mb_start_time',     true );
    $user_finish        = get_user_meta( $user_id, 'mb_finish_time',    true );
    $user_lunch_in      = get_user_meta( $user_id, 'mb_lunch_start',    true );
    $user_lunch_out     = get_user_meta( $user_id, 'mb_lunch_finish',   true );
    $user_current_loc   = get_user_meta( $user_id, 'mb_user_location_current',  true );
    $user_previous_loc  = get_user_meta( $user_id, 'mb_user_location_previous', true );


    // set times if not set in user settings
    $user_start         = ( empty( $user_start      ) ? $default_start      : strtotime( $user_start     ) );
    $user_finish        = ( empty( $user_finish     ) ? $default_finish     : strtotime( $user_finish    ) );
    $user_lunch_in      = ( empty( $user_lunch_in   ) ? $$default_lunch_in  : strtotime( $user_lunch_in  ) );
    $user_lunch_out     = ( empty( $user_lunch_out  ) ? $default_lunch_out  : strtotime( $user_lunch_out ) );


    // can we use the task feature
    if( $use_tasks == 'yes' ) {

        // reset the manual / auto
        if( $current_time > $next_midnight ) {
            update_user_meta( $user_id, 'mb_user_automatic_change', '1' );
            delete_user_meta( $user_id, 'mb_user_manual_change'         );
        }

        // is the current location able to be auto switched
        // or we have flagged it has run by auto
        if( $mb_location_array[$user_current_loc]['z'] == 'yes' || get_user_meta( $user_id, 'mb_user_automatic_change', true ) == 1 ) {

            // set user to available
            if( !($current_time < $user_start && $current_time > $user_finish) ) {
                update_user_meta( $user_id, 'mb_user_location_previous',    $user_current_loc   );
                update_user_meta( $user_id, 'mb_user_location_current',     'available'                 );
                update_user_meta( $user_id, 'mb_user_automatic_change',     '1'                 );
            }


            // set user to unavailable
            if( ($current_time < $user_start && $current_time > $user_finish) || $is_weekend ) {
                update_user_meta( $user_id, 'mb_user_location_previous',    $user_current_loc   );
                update_user_meta( $user_id, 'mb_user_location_current',     'unavailable'                   );
                update_user_meta( $user_id, 'mb_user_automatic_change',     '1'                 );
            }


            // set user lunch
            if( $current_time > $user_lunch_in && $current_time < $user_lunch_out ) {
                update_user_meta( $user_id, 'mb_user_location_previous',    $user_current_loc   );
                update_user_meta( $user_id, 'mb_user_location_current',     'at-lunch'                  );
                update_user_meta( $user_id, 'mb_user_automatic_change',     '1'                 );
            }


            // if it was auto switched - flagged
            if(
                get_user_meta( $user_id, 'mb_user_automatic_change', true ) == 1 &&

                (
                    // isnt in the auto task
                    (!($current_time < $user_start && $current_time > $user_finish)) ||
                    (($current_time < $user_start || $current_time > $user_finish) || $is_weekend) ||
                    ($current_time > $user_lunch_in && $current_time < $user_lunch_out)
                )

            ) {
                delete_user_meta( $user_id, 'mb_user_automatic_change' );
                update_user_meta( $user_id, 'mb_user_location_current',     $user_previous_loc  );
            }
        }
    }
}