Revert "Fix cant get right format chinese date format error"

This reverts commit 8c58385d6c.

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('/^(\[\$[A-Z]*-[0-9A-F]*\])/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

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,