get_post_timestamp( int|WP_Post $post = null, string $field = 'date' ): int|false

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   Sam Kent 4 years ago

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   How to get the published and modified date with get_post_timestamp() and then convert it into a readable format.

   <?php
   function published_modified_date() {
   
   	// UNIX published date
   	$unix_published_date = get_post_timestamp( '', 'date' );
   
   	// UNIX modified date
   	$unix_modified_date = get_post_timestamp( '', 'modified' );
   	
       // Convert from UNIX timestamp into readable date
       // Reference: https://developer.wordpress.org/reference/functions/date_i18n
   	$published_date = date_i18n( get_option( 'date_format' ), $unix_published_date );
   	$modified_date = date_i18n( get_option( 'date_format' ), $unix_modified_date );
   	
       // Convert from UNIX timestamp into full date/time (ISO)
       // Reference: https://wordpress.org/support/article/formatting-date-and-time
   	$full_published_date = date_i18n( 'c', $unix_published_date );
   	$full_modified_date = date_i18n( 'c', $unix_modified_date );
   	
       ?>
   
   	<span class="published"><time datetime="<?php echo $full_published_date; ?>"><?php echo $published_date; ?></time></span>
   	
       <?php
       // If modified date is greater than published date by 1 day 
       if ( $unix_modified_date > $unix_published_date + 86400 ) { ?>
   		<span class="modified">Modified on: <time datetime="<?php echo $full_modified_date; ?>"><?php echo $modified_date; ?></time></span>
   	    <?php
       }
   
   }