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The plugin allows to change theme (template) on desired dates. 
If you want a Christmas theme automatically on your blog just for 5 days (or more), the plugin will do it for you.
Just enter a start date, an end date , select times and the theme which you want to use, that’s it.
You can have as many combinations as you wish.
A theme for each seasons, halloween theme, christmas theme… or even a day and night theme…
<h3>Admin Panel</h3>
The admin panel will allow to move re-order your theme changes. 
Just remember that, the top is the lowest and the bottom is the highest level. 
So, if you have a theme change (‘theme1’) set for the 23/07 – 01/08 first and theme change (‘theme2’) for the 24/07 – 26/07, and today’s date is 24/07, 
‘theme2’ will be displayed unless you move down ‘theme1’.”
The rules, which you have created, will stay year on year.

WP Change Template

The plugin allows to change theme (template) on desired dates.

PC Futures

<h4>Basic Instructions</h4>
This plugin works out-of-the-box, so once the plugin is installed, you can place a shortcode wherever you want.
Use the shortcode <code>[pcf_ny_countdown]</code> to output the countdown.
The countdown will output in days by default (e.g ‘105 days until New Year!’).
<h4>Changing output type</h4>
The shortcode can be given a ‘type’ attribute, like so:
<pre><code>[pcf_ny_countdown type="days|weeks|sleeps"]
</code></pre>
This enables you to change the output type.
There are 3 types to choose from:
<ul>
<li>Days</li>
<li>Weeks</li>
<li>Sleeps</li>
</ul>
If you do not specify the type attribute, or specify an invalid type, it will default to ‘days’.
Example:
<pre><code>[pcf_ny_countdown type="weeks"]
</code></pre>
will output as
<pre><code>It's `x` weeks and `y` days until New Year!
</code></pre>
<h4>Styling the output</h4>
Styling the output is an advanced setting, that involves writing custom CSS.
The shortcode can be given an ‘id’ attribute, which can then be used to style the output using CSS.
For example,
<pre><code>[pcf_ny_countdown id="my-id"]
</code></pre>
would output in HTML as
<pre><code>...
</code></pre>
You can then add custom CSS through <code>Appearance > Editor</code>. If your theme supports custom CSS, you may be able to add your styles in Theme Options. If there is a custom css file in Editor, it is advised to use that for custom styles.
Here is an example of some custom styles:
<pre><code>#my-id{
 color: red;
 font-size: 16px;
 text-decoration: underline;
}
</code></pre>
This will set the output to be red, underlined, and to have a font size of 16px.

PCF New Year Countdown

A simple plugin that creates an easy to use New Year countdown for your WordPress sites.

WP Change Template vs PCF New Year Countdown