diff --git a/wp-includes/general-template.php b/wp-includes/general-template.php
index c7139c52db..99ae18b044 100644
--- a/wp-includes/general-template.php
+++ b/wp-includes/general-template.php
@@ -2254,26 +2254,37 @@ function the_modified_date( $d = '', $before = '', $after = '', $echo = true ) {
  * Retrieve the date on which the post was last modified.
  *
  * @since 2.1.0
+ * @since 4.6.0 The `$post` parameter was added.
  *
- * @param string $d Optional. PHP date format. Defaults to the "date_format" option
- * @return string
+ * @param string      $d    Optional. PHP date format defaults to the date_format option if not specified.
+ * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default current post.
+ * @return false|string Date the current post was modified. False on failure.
  */
-function get_the_modified_date($d = '') {
-	if ( '' == $d )
-		$the_time = get_post_modified_time(get_option('date_format'), null, null, true);
-	else
-		$the_time = get_post_modified_time($d, null, null, true);
+function get_the_modified_date( $d = '', $post = null ) {
+	$post = get_post( $post );
+
+	if ( ! $post ) {
+		return false;
+	}
+
+	if ( empty( $d ) ) {
+		$the_time = get_post_modified_time( get_option( 'date_format' ), false, $post, true );
+	} else {
+		$the_time = get_post_modified_time( $d, false, $post, true );
+	}
 
 	/**
 	 * Filters the date a post was last modified.
 	 *
 	 * @since 2.1.0
+	 * @since 4.6.0 The `$post` parameter was added.
 	 *
-	 * @param string $the_time The formatted date.
-	 * @param string $d        PHP date format. Defaults to value specified in
-	 *                         'date_format' option.
+	 * @param string  $the_time The formatted date.
+	 * @param string  $d        PHP date format. Defaults to value specified in
+	 *                          'date_format' option.
+	 * @param WP_Post $post     WP_Post object.
 	 */
-	return apply_filters( 'get_the_modified_date', $the_time, $d );
+	return apply_filters( 'get_the_modified_date', $the_time, $d, $post );
 }
 
 /**
@@ -2397,27 +2408,40 @@ function the_modified_time($d = '') {
  * Retrieve the time at which the post was last modified.
  *
  * @since 2.0.0
+ * @since 4.6.0 The `$post` parameter was added.
  *
- * @param string $d Optional Either 'G', 'U', or php date format defaults to the value specified in the time_format option.
- * @return string
+ * @param string      $d     Optional. Format to use for retrieving the time the post
+ *                           was modified. Either 'G', 'U', or php date format defaults
+ *                           to the value specified in the time_format option. Default empty.
+ * @param int|WP_Post $post  Optional. Post ID or WP_Post object. Default current post.
+ * @return false|string Formatted date string or Unix timestamp. False on failure.
  */
-function get_the_modified_time($d = '') {
-	if ( '' == $d )
-		$the_time = get_post_modified_time(get_option('time_format'), null, null, true);
-	else
-		$the_time = get_post_modified_time($d, null, null, true);
+function get_the_modified_time( $d = '', $post = null ) {
+	$post = get_post( $post );
+
+	if ( ! $post ) {
+		return false;
+	}
+
+	if ( empty( $d ) ) {
+		$the_time = get_post_modified_time( get_option( 'time_format' ), false, $post, true );
+	} else {
+		$the_time = get_post_modified_time( $d, false, $post, true );
+	}
 
 	/**
 	 * Filters the localized time a post was last modified.
 	 *
 	 * @since 2.0.0
+	 * @since 4.6.0 The `$post` parameter was added.
 	 *
 	 * @param string $the_time The formatted time.
 	 * @param string $d        Format to use for retrieving the time the post was
 	 *                         written. Accepts 'G', 'U', or php date format. Defaults
 	 *                         to value specified in 'time_format' option.
+	 * @param WP_Post $post    WP_Post object.
 	 */
-	return apply_filters( 'get_the_modified_time', $the_time, $d );
+	return apply_filters( 'get_the_modified_time', $the_time, $d, $post );
 }
 
 /**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 6a5fd24749..abb4661760 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-alpha-37737';
+$wp_version = '4.6-alpha-37738';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.