diff --git a/CHANGELOG.md b/CHANGELOG.md
index 85f3e7d5..a3d0130c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+- Remove locale from formatting string - [#644](https://github.com/PHPOffice/PhpSpreadsheet/pull/644)
+
+
 ### Fixed
 
 - Allow iterators to go out of bounds with prev - [#587](https://github.com/PHPOffice/PhpSpreadsheet/issues/587)
diff --git a/src/PhpSpreadsheet/Style/NumberFormat.php b/src/PhpSpreadsheet/Style/NumberFormat.php
index 63ef20ae..dc52a841 100644
--- a/src/PhpSpreadsheet/Style/NumberFormat.php
+++ b/src/PhpSpreadsheet/Style/NumberFormat.php
@@ -691,6 +691,9 @@ class NumberFormat extends Supervisor
                     // Strip #
                     $format = preg_replace('/\\#/', '0', $format);
 
+                    // Remove locale code [$-###]
+                    $format = preg_replace('/\[\$\-.*\]/', '', $format);
+
                     $n = '/\\[[^\\]]+\\]/';
                     $m = preg_replace($n, '', $format);
                     $number_regex = '/(0+)(\\.?)(0*)/';
diff --git a/tests/data/Style/NumberFormat.php b/tests/data/Style/NumberFormat.php
index 196fa2c6..a7584ee4 100644
--- a/tests/data/Style/NumberFormat.php
+++ b/tests/data/Style/NumberFormat.php
@@ -186,4 +186,24 @@ return [
         -1234567.8899999999,
         '0000:00.00',
     ],
+    [
+        '18.952',
+        18.952,
+        '[$-409]General',
+    ],
+    [
+        '9.98',
+        9.98,
+        '[$-409]#,##0.00;-#,##0.00',
+    ],
+    [
+        '18.952',
+        18.952,
+        '[$-1010409]General',
+    ],
+    [
+        '9.98',
+        9.98,
+        '[$-1010409]#,##0.00;-#,##0.00',
+    ],
 ];
diff --git a/tests/data/Style/NumberFormatDates.php b/tests/data/Style/NumberFormatDates.php
index 5b74fbed..be8dc966 100644
--- a/tests/data/Style/NumberFormatDates.php
+++ b/tests/data/Style/NumberFormatDates.php
@@ -62,4 +62,14 @@ return [
         43270.603472222,
         'hh:mm:ss\ AM/PM',
     ],
+    [
+        '8/20/2018',
+        43332,
+        '[$-409]m/d/yyyy',
+    ],
+    [
+        '8/20/2018',
+        43332,
+        '[$-1010409]m/d/yyyy',
+    ],
 ];