Add date after related post title


I'm using Yet Another Related Post Plugin for my site

I'd like to add date after the post title by using this code below but i don't know where is the place need to be add. Please help me take a look.
$output .= '<label style=&quot;color:#888888;font-size:11px;padding-top:2px;font-style:italic;&quot;> ' . date_format(date_create($search->post_date),&quot;d/m/Y&quot;) . ' </label>';

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Thank you,