Date/Time: Introduce `current_datetime()` for better time operations.

Returning a `DateTimeImmutable` representation of the current moment in time, this allows for a more flexible and reliable use than `current_time()` provides.

Props Rarst.
Fixes #47464.
Built from https://develop.svn.wordpress.org/trunk@45883


git-svn-id: http://core.svn.wordpress.org/trunk@45694 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/dashboard.php

@@ -860,7 +860,7 @@ function wp_dashboard_recent_posts( $args ) {
 		echo '<ul>';
 
 		$today    = current_time( 'Y-m-d' );
-		$tomorrow = gmdate( 'Y-m-d', strtotime( '+1 day', current_time( 'timestamp' ) ) );
+		$tomorrow = current_datetime()->modify( '+1 day' )->format( 'Y-m-d' );
 		$year     = current_time( 'Y' );
 
 		while ( $posts->have_posts() ) {

wp-includes/functions.php

@@ -79,6 +79,17 @@ function current_time( $type, $gmt = 0 ) {
 	return $datetime->format( $type );
 }
 
+/**
+ * Retrieves the current time as an object with the timezone from settings.
+ *
+ * @since 5.3.0
+ *
+ * @return DateTimeImmutable Date and time object.
+ */
+function current_datetime() {
+	return new DateTimeImmutable( 'now', wp_timezone() );
+}
+
 /**
  * Retrieves the timezone from current settings as a string.
  *

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45882';
+$wp_version = '5.3-alpha-45883';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.