Only display the modified post date if the post has been modified (#46839)

* Only display the modified post date if the post has been modified

* Add wp-block-post-date__modified-date to the $classes array

* Update index.php

* Update packages/block-library/src/post-date/index.php

Co-authored-by: Ari Stathopoulos <[email protected]>

---------

Co-authored-by: Ari Stathopoulos <[email protected]>

Author: carolinan

packages/block-library/src/post-date/edit.js

@@ -37,6 +37,7 @@ export default function PostDateEdit( {
 	const blockProps = useBlockProps( {
 		className: classnames( {
 			[ `has-text-align-${ textAlign }` ]: textAlign,
+			[ `wp-block-post-date__modified-date` ]: displayType === 'modified',
 		} ),
 	} );
 
@@ -175,6 +176,9 @@ export default function PostDateEdit( {
 							} )
 						}
 						checked={ displayType === 'modified' }
+						help={ __(
+							'Only shows if the post has been modified'
+						) }
 					/>
 				</PanelBody>
 			</InspectorControls>

packages/block-library/src/post-date/index.php

@@ -18,25 +18,34 @@ function render_block_core_post_date( $attributes, $content, $block ) {
 		return '';
 	}
 
-	$post_ID = $block->context['postId'];
+	$post_ID          = $block->context['postId'];
+	$formatted_date   = get_the_date( empty( $attributes['format'] ) ? '' : $attributes['format'], $post_ID );
+	$unformatted_date = esc_attr( get_the_date( 'c', $post_ID ) );
+	$classes          = array();
 
-	$classes = array();
 	if ( isset( $attributes['textAlign'] ) ) {
 		$classes[] = 'has-text-align-' . $attributes['textAlign'];
 	}
 	if ( isset( $attributes['style']['elements']['link']['color']['text'] ) ) {
 		$classes[] = 'has-link-color';
 	}
-	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classes ) ) );
 
+	/*
+	 * If the "Display last modified date" setting is enabled,
+	 * only display the modified date if it is later than the publishing date.
+	 */
 	if ( isset( $attributes['displayType'] ) && 'modified' === $attributes['displayType'] ) {
-		$formatted_date   = get_the_modified_date( empty( $attributes['format'] ) ? '' : $attributes['format'], $post_ID );
-		$unformatted_date = esc_attr( get_the_modified_date( 'c', $post_ID ) );
-	} else {
-		$formatted_date   = get_the_date( empty( $attributes['format'] ) ? '' : $attributes['format'], $post_ID );
-		$unformatted_date = esc_attr( get_the_date( 'c', $post_ID ) );
+		if ( get_the_modified_date( 'Ymdhi', $post_ID ) > get_the_date( 'Ymdhi', $post_ID ) ) {
+			$formatted_date   = get_the_modified_date( empty( $attributes['format'] ) ? '' : $attributes['format'], $post_ID );
+			$unformatted_date = esc_attr( get_the_modified_date( 'c', $post_ID ) );
+			$classes[]        = 'wp-block-post-date__modified-date';
+		} else {
+			return '';
+		}
 	}
 
+	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classes ) ) );
+
 	if ( isset( $attributes['isLink'] ) && $attributes['isLink'] ) {
 		$formatted_date = sprintf( '<a href="%1s">%2s</a>', get_the_permalink( $post_ID ), $formatted_date );
 	}