Atiq Samtia

Change the Post Update date for all posts and pages in one click. This will help your blog in search engines and your blog will look alive. Do this every week or month.
<h4>Why Change the Update/Modified Dates of posts or Pages?</h4>
With massive increasde in blogs and content, now search engines like Google do rank the newly added or modified content higher than the older one. If the article was published in the past, Google thinks it is no longer relevent and de-ranks that. It is recommended by SEO experts that you should update the content regularly. 
If you update the posts manually, it would require a lot of effort weekly. If you have articles 500+ imagine how much time it would take you to do manually? This plugin will assist you in this regard and with only one click you are good to go.
<h4>Features</h4>
<ul>
<li>Update Posts Modified date in bulk</li>
<li>Update Pages Modified date in bulk</li>
<li>Update Any Custom Post Type dates in bulk</li>
<li>Update Post Comments dates in bulk</li>
<li>It Randomly distributes dates so it look realistic in the eyes of search engines</li>
<li>Select Custom Interval or Date Range </li>
<li>Apply on posts from specific categories</li>
<li>Apply on specific pages</li>
<li>Option to change Published Date or Modified Date</li>
</ul>
<h4>Support</h4>
<ul>
<li>Community support via the <a href="https://wordpress.org/support/plugin/bulk-post-update-date" rel="ugc">support forums</a> at WordPress.org.</li>
</ul>

Bulk Post Update Date

Working out of the box.

Thanks for the plugin.

Outstanding

Change the Post Update date for all posts and pages in one click. This will help your blog in search engines and your blog will look alive.

dahousecatz

Adds a bulk action to all post types to allow setting the publish date to a specific date time.
The bulk action is by default applied to all post types.
The plugin uses input types of date and time to allow users to set the desired publish date / time.
This is a very lightweight plugin as has as little code as possible, and is also designed to be developer friendly 
with alter hooks allowing other plugins to make changes to how this plugin operates.

Bulk edit publish date

Took me hours to find this plugin - this is exactly what I needed, and does the job very nicely.

I had 300 posts that needed to go live at midnight in two weeks, and it would have taken ages to do it the normal Wordpress way, so this plugin enabled me to do it in 5 minutes (including installing the plugin!).

Fantastic Plugin!

Thank you, this plugin works perfectly. Just what I needed.

Works like a charm!

Adds a bulk action to all post types to allow setting the publish date to a specific date time.

Bulk Post Update Date vs Bulk edit publish date