Jatinder Pal Singh

Schedule your content plugin can help you in showing content within your wordpress blog for a specific period. You can decide when to start showing content and when to stop showing content. 
This plugin uses shortcodes which can be written within the post content or page content or in text widget also. This plugin uses 4 parameters to schedule your content. 
shortcode: [scheduler] Here is your content[/scheduler] 
Parameters: start_date, start_time, end_date, end_time
Date must be in YYYY-MM-DD format and time must be in 24-hour format.
<ul>
<li>Here is the simple example where you schedule your content for specific period:</li>
</ul>
[scheduler start_date=’2012-05-13′ start_time=’06:30′ end_date=’2012-06-13′ end_time=’09:30′] 
This is scheduled Content. 
[/scheduler]
<ul>
<li>Here is the example where you want to schedule your content daily within 9am to 10am.</li>
</ul>
[scheduler start_date=” start_time=’09:00′ end_date=” end_time=’10:00′] 
This is scheduled Content. 
[/scheduler]
<ul>
<li>Here is the example when you want your content should be expired on specific date and time.</li>
</ul>
[scheduler start_date=” start_time=” end_date=’2012-05-16′ end_time=’10:00′] 
This is scheduled Content. 
[/scheduler]
<ul>
<li>Here is the example when you want to start showing your content on specific date and time and do not want it to be expired.</li>
</ul>
[scheduler start_date=’2012-05-12′ start_time=’10:00′ end_date=’2099-05-16′ end_time=”] 
This is scheduled Content. 
[/scheduler]

Schedule Your Content

Now you decide when to show what within your POST or PAGE or TEXT Widget content. Easy to use shortcode

Bill Erickson

Warning This plugin is no longer supported, and does not always work with the Gutenberg block editor.
I recommend using <a href="https://wordpress.org/plugins/change-last-modified-date/" rel="ugc">Change Last Modified Date</a> instead.
<h4>Summary</h4>
Prevent the modified date from changing when making minor changes to your content.
This plugin adds a checkbox to the Publish box, “Don’t update the modified date”. When checked, saving your post does not update the post modified date.
Minor changes like adding tags or fixing typos won’t bump the modified date.
This plugin will maintain the previous modified date. It does not let you specify a custom modified date.
When you’re ready to publish a major content change, you can uncheck this setting before saving the post.
<h4>Customization</h4>
Your theme will need to use <code>get_the_modified_date()</code> to display the modified date.
This plugin only applies to the <code>post</code> post type by default. You can customize which post types it appears on using the <code>limit_modified_date_post_types</code> filter.
<pre><code>add_filter( 'limit_modified_date_post_types', function( $post_types ) {
 $post_types[] = 'page';
 return $post_types;
});
</code></pre>

Limit Modified Date

Prevent the "modified date" from changing when making minor changes to your content.

Schedule Your Content vs Limit Modified Date