Ok, you need to copy the file content.php from the original TwentyFifteen theme into your child theme as well.
Open up the content.php file in your child theme and look for the following code
the_content(
sprintf(
/* translators: %s: Post title. */
__( 'Continue reading %s', 'twentyfifteen' ),
the_title( '<span class="screen-reader-text">', '</span>', false )
)
);
Replace that code with the following piece of code
if ( is_category() ) {
the_excerpt();
} else {
the_content(
sprintf(
/* translators: %s: Post title. */
__( 'Continue reading %s', 'twentyfifteen' ),
the_title( '<span class="screen-reader-text">', '</span>', false )
)
);
}
That should make it so that post content showing up inside of a category list show the post excerpt instead of the full post content which I believe is what you were going for.
Regarding the post date, we need to pull a piece of code from the /inc/template-tags.php file inside of the original TwentyFifteen theme. Here is the chunk of code for displaying the post date
if ( in_array( get_post_type(), array( 'post', 'attachment' ) ) ) {
$time_string = '<time class="entry-date published updated" datetime="%1$s">%2$s</time>';
if ( get_the_time( 'U' ) !== get_the_modified_time( 'U' ) ) {
$time_string = '<time class="entry-date published" datetime="%1$s">%2$s</time><time class="updated" datetime="%3$s">%4$s</time>';
}
$time_string = sprintf(
$time_string,
esc_attr( get_the_date( 'c' ) ),
get_the_date(),
esc_attr( get_the_modified_date( 'c' ) ),
get_the_modified_date()
);
printf(
'<span class="posted-on"><span class="screen-reader-text">%1$s </span><a href="%2$s" rel="bookmark">%3$s</a></span>',
_x( 'Posted on', 'Used before publish date.', 'twentyfifteen' ),
esc_url( get_permalink() ),
$time_string
);
}
Copy this piece of code and go back into the content.php file we just modified in your child theme. Look for the following section of code
<?php
if ( is_single() ) :
the_title( '<h1 class="entry-title">', '</h1>' );
else :
the_title( sprintf( '<h2 class="entry-title"><a href="%s" rel="bookmark">', esc_url( get_permalink() ) ), '</a></h2>' );
endif;
?>
Insert the post date code after the endif; line but before the ?> line so it looks like the following
<?php
if ( is_single() ) :
the_title( '<h1 class="entry-title">', '</h1>' );
else :
the_title( sprintf( '<h2 class="entry-title"><a href="%s" rel="bookmark">', esc_url( get_permalink() ) ), '</a></h2>' );
endif;
if ( in_array( get_post_type(), array( 'post', 'attachment' ) ) ) {
$time_string = '<time class="entry-date published updated" datetime="%1$s">%2$s</time>';
if ( get_the_time( 'U' ) !== get_the_modified_time( 'U' ) ) {
$time_string = '<time class="entry-date published" datetime="%1$s">%2$s</time><time class="updated" datetime="%3$s">%4$s</time>';
}
$time_string = sprintf(
$time_string,
esc_attr( get_the_date( 'c' ) ),
get_the_date(),
esc_attr( get_the_modified_date( 'c' ) ),
get_the_modified_date()
);
printf(
'<span class="posted-on"><span class="screen-reader-text">%1$s </span><a href="%2$s" rel="bookmark">%3$s</a></span>',
_x( 'Posted on', 'Used before publish date.', 'twentyfifteen' ),
esc_url( get_permalink() ),
$time_string
);
}
?>
That should place the date of the post under the title but before the content. It will still show the date of the post at the bottom of the content as well since we didn’t modify the /inc/template-tags.php file to remove it from there but it won’t cause any issues having it twice on the post.
