echoz

The archives within WordPress are pretty limited in a sense that they do not offer much configuration beyond what they do. Date based will be date based, like category based archives will only display categories. This plugin mitigates the issue by giving date based archives the ability to list content by categories as well.
This is done via modification of the rewrite rules to allow for the ability to have permalinks like http://yourblog.com/2008/in-blog/. This basically is a date based archive that shows only entries from the “blog” category.
This plugin can also work without the usage of rewrite rules. It currently supports date based archives for years and months.
<h3>Usable Commands for Theme Developers</h3>
The PHP commands for theme developers to use are pretty straight forward.
cba_get_category_id() returns the current category ID of the archive.
cba_the_year() returns the current year of the date based archive.
cba_the_month() returns the current month of the date based archive.
cba_auto_thedate() gets the string representation of the date.
cba_get_year_link($year) returns the permalink for the year archive based on the current category.

Category Based Archives

Allows date based archives to be listed by category.

Scott Reilly

This plugin provides thirteen handy template tags that relate to the index/position of a post within a loop’s listing of posts.
Some of the template tags provided by this plugin relate to the position of the current post within the current loop:
<ul>
<li><code>c2c_is_first()</code></li>
<li><code>c2c_is_last()</code></li>
<li><code>c2c_is_at_index()</code></li>
<li><code>c2c_is_even()</code></li>
<li><code>c2c_is_odd()</code></li>
<li><code>c2c_get_the_index()</code></li>
<li><code>c2c_is_index_within()</code></li>
<li><code>c2c_the_index()</code></li>
</ul>
Other functions help you get a post (or posts) at a given position in the current loop:
<ul>
<li><code>c2c_get_post_by_index()</code></li>
<li><code>c2c_get_posts_by_index()</code></li>
</ul>
While the remaining three functions relate to index information about the loop in general:
<ul>
<li><code>c2c_get_last_index()</code></li>
<li><code>c2c_is_post_in_loop()</code></li>
<li><code>c2c_is_valid_index()</code></li>
</ul>
Please see the Template Tags section (in some places found under the Other Notes section) for descriptions of all the functions and their arguments.
Note that index counting begins at 0, which means the first item has an index of 0. An index of -1 indicates no posts were found.
Links: <a href="https://coffee2code.com/wp-plugins/post-index-helpers/" rel="nofollow ugc">Plugin Homepage</a> | <a href="https://wordpress.org/plugins/post-index-helpers/" rel="ugc">Plugin Directory Page</a> | <a href="https://github.com/coffee2code/post-index-helpers/" rel="nofollow ugc">GitHub</a> | <a href="https://coffee2code.com" rel="nofollow ugc">Author Homepage</a>
<h3>Developer Documentation</h3>
Developer documentation can be found in <a href="https://github.com/coffee2code/post-index-helpers/blob/master/DEVELOPER-DOCS.md" rel="nofollow ugc">DEVELOPER-DOCS.md</a>. That documentation covers the numerous template tags provided by the plugin.
As an overview, these are the template tags provided the plugin:
<ul>
<li><code>c2c_get_last_index()</code> : Gets the index number for the last post in the loop listing</li>
<li><code>c2c_get_post_by_index()</code> : Get post based on specified index</li>
<li><code>c2c_get_posts_by_index()</code> : Get posts based on specified array of indexes</li>
<li><code>c2c_get_the_index()</code> : Get the index for the current post</li>
<li><code>c2c_is_at_index()</code> : Is the current index at the specified index?</li>
<li><code>c2c_is_even()</code> : Is the current post at an even position? (i.e. 0, 2, 4, …)</li>
<li><code>c2c_is_first()</code> : Is the current post the first listed post?</li>
<li><code>c2c_is_last()</code> : Is the current post the last listed post?</li>
<li><code>c2c_is_odd()</code> : Is the current post at an odd position? (i.e. 1, 3, 5, …)</li>
<li><code>c2c_is_index_within()</code> : Is the current post (or one at the specified index) within the bounds of a specified range?</li>
<li><code>c2c_is_post_in_loop()</code> : Is the specified post within the current loop?</li>
<li><code>c2c_is_valid_index()</code> : Is the specified index valid?</li>
<li><code>c2c_the_index()</code> : Echo the current post’s index</li>
</ul>

Post Index Helpers

A variety of template tags related to the index/position of a post within a loop's listing of posts.

Category Based Archives vs Post Index Helpers