Incorrect Date on Posts and Double images on Posts

Hi Ahmed,
Please find my answers below:
1. The first question: “Just tested theme with a post and the date showing seems to be wrong. Can this be rectified?”
>> Please go to Dashboard > Appearance > Editor. Then click on “Theme Functions” (functions.php) on the right menu

Find

$cmt_date = $from;

Replace With

global $post;
if( $post ) {
$from = $post->post_date;
}

2. The second question: “both featured image and image thumbnail are showing on posts. How can i disable thumbnail as my previous theme only showed thumbs and not featured images on all my posts?”
>>> If you want to remove the Featured image on single post, please go to Dashboard > Appearance > Editor. Click on “content-single.php” on the right menu

Then remove those codes:

<?php if( has_post_thumbnail() && ! has_post_format('video') && ! has_post_format('audio') && ! has_post_format('gallery') ) : ?>
<div class="entry-thumbnail">
<?php the_post_thumbnail(''); ?>
</div>
<?php endif; ?>

Hope they answer your questions
Regards,
Jackie