diff --git a/CHANGELOG.md b/CHANGELOG.md
index cefe1590..24ddedc4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -44,6 +44,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 ### Changed
 
 - Updated the CONVERT() function to support all current MS Excel categories and Units of Measure.
+- `formatAsDate` correctly matches language metadata, reverting c55272e
 
 ### Deprecated
 
diff --git a/src/PhpSpreadsheet/Style/NumberFormat.php b/src/PhpSpreadsheet/Style/NumberFormat.php
index 0b761bd3..9a0acb6f 100644
--- a/src/PhpSpreadsheet/Style/NumberFormat.php
+++ b/src/PhpSpreadsheet/Style/NumberFormat.php
@@ -469,7 +469,7 @@ class NumberFormat extends Supervisor
         // general syntax: [$<Currency string>-<language info>]
         // language info is in hexadecimal
         // strip off chinese part like [DBNum1][$-804]
-        $format = preg_replace('/^(\[[0-9A-Za-z]*\])*(\[\$[A-Z]*-[0-9A-F]*\])/i', '', $format);
+        $format = preg_replace('/^(\[DBNum\d\])*(\[\$[^\]]*\])/i', '', $format);
 
         // OpenOffice.org uses upper-case number formats, e.g. 'YYYY', convert to lower-case;
         //    but we don't want to change any quoted strings
diff --git a/tests/data/Style/NumberFormatDates.php b/tests/data/Style/NumberFormatDates.php
index 9e476042..331a080c 100644
--- a/tests/data/Style/NumberFormatDates.php
+++ b/tests/data/Style/NumberFormatDates.php
@@ -36,22 +36,6 @@ return [
         22269.0625,
         '"y-m-d "yyyy-mm-dd" h:m:s "hh:mm:ss',
     ],
-    // Chinese date format
-    [
-        '1960年12月19日',
-        22269.0625,
-        '[DBNum1][$-804]yyyy"年"m"月"d"日";@',
-    ],
-    [
-        '1960年12月',
-        22269.0625,
-        '[DBNum1][$-804]yyyy"年"m"月";@',
-    ],
-    [
-        '12月19日',
-        22269.0625,
-        '[DBNum1][$-804]m"月"d"日";@',
-    ],
     [
         '07:35:00 AM',
         43270.315972222,
@@ -77,4 +61,15 @@ return [
         1.1354166666667,
         '[h]:mm',
     ],
+    [
+        '19331018',
+        12345.6789,
+        '[DBNum4][$-804]yyyymmdd;@',
+    ],
+    // Technically should be １９３３１０１８
+    [
+        '19331018',
+        12345.6789,
+        '[DBNum3][$-zh-CN]yyyymmdd;@',
+    ],
 ];