Index: src/wp-admin/edit-form-advanced.php
===================================================================
--- src/wp-admin/edit-form-advanced.php	(revision 45989)
+++ src/wp-admin/edit-form-advanced.php	(working copy)
@@ -167,7 +167,12 @@
 }
 
 /* translators: Publish box date format, see https://secure.php.net/date */
-$scheduled_date = date_i18n( __( 'M j, Y @ H:i' ), strtotime( $post->post_date ) );
+$scheduled_date = sprintf(
+	/* translators: Publish box datetime format. 1: Date, 2: Time. */
+	__( '%1$s at %2$s' ),
+	date_i18n( _x( 'M j, Y', 'publish box date format. See https://secure.php.net/date' ), strtotime( $post->post_date ) ),
+	date_i18n( _x( 'H:i', 'publish box time format. See https://secure.php.net/date' ), strtotime( $post->post_date ) )
+);
 
 $messages['post']       = array(
 	0  => '', // Unused. Messages start at index 1.
Index: src/wp-admin/includes/meta-boxes.php
===================================================================
--- src/wp-admin/includes/meta-boxes.php	(revision 45989)
+++ src/wp-admin/includes/meta-boxes.php	(working copy)
@@ -194,8 +194,10 @@
 </div><!-- .misc-pub-section -->
 
 	<?php
-	/* translators: Publish box date format, see https://secure.php.net/date */
-	$datef = __( 'M j, Y @ H:i' );
+	/* translators: Publish box datetime format. 1: Date, 2: Time. */
+	$datef      = __( '%1$s at %2$s' );
+	$datef_date = _x( 'M j, Y', 'publish box date format. See https://secure.php.net/date' );
+	$datef_time = _x( 'H:i', 'publish box time format. See https://secure.php.net/date' );
 	if ( 0 != $post->ID ) {
 		if ( 'future' == $post->post_status ) { // scheduled for publishing at a future date
 			/* translators: Post date information. %s: Date on which the post is currently scheduled to be published. */
@@ -212,10 +214,18 @@
 			/* translators: Post date information. %s: Date on which the post is to be published. */
 			$stamp = __( 'Publish on: <b>%s</b>' );
 		}
-		$date = date_i18n( $datef, strtotime( $post->post_date ) );
+		$date = sprintf(
+			$datef,
+			date_i18n( $datef_date, strtotime( $post->post_date ) ),
+			date_i18n( $datef_time, strtotime( $post->post_date ) )
+		);
 	} else { // draft (no saves, and thus no date specified)
 		$stamp = __( 'Publish <b>immediately</b>' );
-		$date  = date_i18n( $datef, strtotime( current_time( 'mysql' ) ) );
+		$date  = sprintf(
+			$datef,
+			date_i18n( $datef_date, strtotime( current_time( 'mysql' ) ) ),
+			date_i18n( $datef_time, strtotime( current_time( 'mysql' ) ) )
+		);
 	}
 
 	if ( ! empty( $args['args']['revisions_count'] ) ) :
Index: src/wp-admin/includes/template.php
===================================================================
--- src/wp-admin/includes/template.php	(revision 45989)
+++ src/wp-admin/includes/template.php	(working copy)
@@ -824,7 +824,7 @@
 
 	echo '<div class="timestamp-wrap">';
 	/* translators: 1: Month, 2: Day, 3: Year, 4: Hour, 5: Minute. */
-	printf( __( '%1$s %2$s, %3$s @ %4$s:%5$s' ), $month, $day, $year, $hour, $minute );
+	printf( __( '%1$s %2$s, %3$s at %4$s:%5$s' ), $month, $day, $year, $hour, $minute );
 
 	echo '</div><input type="hidden" id="ss" name="ss" value="' . $ss . '" />';
 
Index: src/wp-includes/script-loader.php
===================================================================
--- src/wp-includes/script-loader.php	(revision 45989)
+++ src/wp-includes/script-loader.php	(working copy)
@@ -1585,7 +1585,7 @@
 				'publishOnFuture'    => __( 'Schedule for:' ),
 				'publishOnPast'      => __( 'Published on:' ),
 				/* translators: 1: Month, 2: Day, 3: Year, 4: Hour, 5: Minute. */
-				'dateFormat'         => __( '%1$s %2$s, %3$s @ %4$s:%5$s' ),
+				'dateFormat'         => __( '%1$s %2$s, %3$s at %4$s:%5$s' ),
 				'showcomm'           => __( 'Show more comments' ),
 				'endcomm'            => __( 'No more comments found.' ),
 				'publish'            => __( 'Publish' ),