diff --git a/wp-includes/post.php b/wp-includes/post.php
index 7636c3d02b..306e567bb9 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -3663,14 +3663,13 @@ function wp_insert_post( $postarr, $wp_error = false ) {
 	}
 
 	if ( 'attachment' !== $post_type ) {
-		if ( 'publish' == $post_status ) {
-			$now = gmdate( 'Y-m-d H:i:59' );
-			if ( mysql2date( 'U', $post_date_gmt, false ) > mysql2date( 'U', $now, false ) ) {
+		if ( 'publish' === $post_status ) {
+			// String comparison to work around far future dates (year 2038+) on 32-bit systems.
+			if ( $post_date_gmt > gmdate( 'Y-m-d H:i:59' ) ) {
 				$post_status = 'future';
 			}
-		} elseif ( 'future' == $post_status ) {
-			$now = gmdate( 'Y-m-d H:i:59' );
-			if ( mysql2date( 'U', $post_date_gmt, false ) <= mysql2date( 'U', $now, false ) ) {
+		} elseif ( 'future' === $post_status ) {
+			if ( $post_date_gmt <= gmdate( 'Y-m-d H:i:59' ) ) {
 				$post_status = 'publish';
 			}
 		}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index e4c76f0ea0..5a3e022021 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45850';
+$wp_version = '5.3-alpha-45851';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.