diff --git a/Classes/PHPExcel/Shared/Date.php b/Classes/PHPExcel/Shared/Date.php
index 01695392..1d44463b 100644
--- a/Classes/PHPExcel/Shared/Date.php
+++ b/Classes/PHPExcel/Shared/Date.php
@@ -256,6 +256,10 @@ class PHPExcel_Shared_Date
 				return true;
 		}
 
+		//	Typically number, currency or accounting (or occasionally fraction) formats
+		if ((substr($pFormatCode,0,1) == '_') || (substr($pFormatCode,0,2) == '0 ')) {
+			return false;
+		}
 		// Try checking for any of the date formatting characters that don't appear within square braces
 		if (preg_match('/(^|\])[^\[]*['.self::$possibleDateFormatCharacters.']/i',$pFormatCode)) {
 			return true;
diff --git a/changelog.txt b/changelog.txt
index ffc201a4..65659539 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -46,6 +46,8 @@ Fixed in SVN:
 - Bugfix:   (MBaker) Workitem 14256 - Worksheet title exception when duplicate worksheet is being renamed but exceeds the 31 character limit
 - Bugfix:   (MBaker) Workitem 14086 - Named range with sheet name that contains the $ throws exception when getting the cell
 - Bugfix:   (MBaker) Added autoloader to DefaultValueBinder and AdvancedValueBinder
+- Bugfix:   (MBaker) Modified PHPExcel_Shared_Date::isDateTimeFormatCode() to return false if format code begins with "_" or with "0 " to prevent false positives
+                     These leading characters are most commonly associated with number, currency or accounting (or occasionally fraction) formats
 
 
 2010-08-26 (v1.7.4):