Display Author, Date, and Category ∞

This custom code will give your teasers a byline in this format:

by (author) on (date) in (category)

First, uncheck the author name, date, and primary category elements under Design Options > Teasers > Teaser Display Options to avoid duplication.

Then, place this code in custom_functions.php:

function my_teaser_byline() {
	global $thesis_design;
	$date_formats = thesis_get_date_formats();
	$use_format = ($thesis_design->teasers['date']['format'] == 'custom') ? $thesis_design->teasers['date']['custom'] : $date_formats[$thesis_design->teasers['date']['format']];
	echo '<span class="teaser_author">';
	thesis_author();
	echo '</span>';
	echo "\n";
	echo '<abbr class="teaser_date published" title="' . get_the_time('Y-m-d') . '">on ' . get_the_time($use_format) . '</abbr>' . "\n";
	$categories = get_the_category();
	echo '<a class="teaser_category" href="' . get_category_link($categories[0]->cat_ID) . '">in ' . $categories[0]->cat_name . '</a>' . "\n";
}

add_action('thesis_hook_after_teaser_headline', 'my_teaser_byline');

Display Date, Edit Link, and Category (on Separate Lines) ∞

This version pulls together the date, edit link, and category, then adds paragraph tags to the category function to put it on a line by itself.

First, uncheck the date, edit post link, and primary category elements under Design Options > Teasers > Teaser Display Options to avoid duplication.

Then, place this code in custom_functions.php:

function my_teaser_byline() {
	global $thesis_design;
	$date_formats = thesis_get_date_formats();
	$use_format = ($thesis_design->teasers['date']['format'] == 'custom') ? $thesis_design->teasers['date']['custom'] : $date_formats[$thesis_design->teasers['date']['format']];
	echo '<abbr class="teaser_date published" title="' . get_the_time('Y-m-d') . '">' . get_the_time($use_format) . '</abbr>' . "\n";
	edit_post_link(__('edit', 'thesis'), '<span class="edit_post">[', ']</span>');
	echo "\n";
	$categories = get_the_category();
	echo '<p><a class="teaser_category" href="' . get_category_link($categories[0]->cat_ID) . '">' . $categories[0]->cat_name . '</a></p>' . "\n";
}

add_action('thesis_hook_after_teaser_headline', 'my_teaser_byline');

/* Re-style the author and children comments */
.custom dl#comment_list .bypostauthor { background: transparent; } /* Reset Thesis default */
.custom dl#comment_list dd { padding-top: 0; } /* Reset Thesis default */
.custom dl#comment_list dd,
   .custom dl#trackback_list dd { padding-left: 0; } /* Reset Thesis default */
.custom dl#comment_list dl dd .format_text { margin-bottom: 0; } /* Reset Thesis default */
.custom dl#comment_list dd div,
   .custom dl#trackback_list dd div { padding-left: 0.9em; }
.custom dl#comment_list dl dd div { padding-left: 1.5em; }
.custom dl#comment_list dt.bypostauthor,
   .custom dl#comment_list dd.bypostauthor>div { background: #E7F8FB none repeat scroll 0 0; }
.custom dl#comment_list dl.children { background: #FFF; padding-left: 1em; padding-top: 1em; }
.custom dl#comment_list dl.children dt { padding-top: 1em; }
.custom dl#comment_list p.reply { margin-bottom: 1em; }