Index: tests/Zend/Date/DateObjectTest.php
===================================================================
--- tests/Zend/Date/DateObjectTest.php	(revision 23659)
+++ tests/Zend/Date/DateObjectTest.php	(working copy)
@@ -106,6 +106,13 @@
         } catch (Zend_Date_Exception $e) {
             // success
         }
+        
+        try {
+            $date = new Zend_Date("12:d5:12", "HH:mm:ss");
+            $this->fail("exception expected");
+        } catch (Zend_Date_Exception $e) {
+            // success
+        }
     }
 
     /**
Index: library/Zend/Locale/Format.php
===================================================================
--- library/Zend/Locale/Format.php	(revision 23659)
+++ library/Zend/Locale/Format.php	(working copy)
@@ -755,7 +755,7 @@
 
         return join($values);
     }
-
+    
     /**
      * Parse date and split in named array fields
      *
@@ -858,6 +858,24 @@
                 $am = false;
             }
         }
+        
+        $parse['length'][$hour] = 1;
+        if ((iconv_substr($format, $hour, 2) == 'HH')) {
+            $parse['length'][$hour] = 2;
+        }
+        $parse['length'][$min] = 1;
+        if ((iconv_substr($format, $min, 2) == 'mm')) {
+            $parse['length'][$min] = 2;
+        }
+        $parse['length'][$sec] = 1;
+        if ((iconv_substr($format, $sec, 2) == 'ss')) {
+            $parse['length'][$sec] = 2;
+        }
+        
+        if (!Zend_Locale_Format::_validateNumberString($number, $parse)) {
+            require_once 'Zend/Locale/Exception.php';
+            throw new Zend_Locale_Exception("Date string '$date' is not valid.");
+        }
 
         // split number parts
         $split = false;
@@ -1050,6 +1068,28 @@
     }
 
     /**
+     * Validate the number string, only numeric values allowed
+     * 
+     * @param string $number		Date string
+     * @param array	 $parsedformat	Parsed date format array
+     * 
+     * @return boolean
+     */
+    private static function _validateNumberString($number, $parsedformat)
+    {
+    	foreach ($parsedformat as $key => $value) {
+    		if (isset($parsedformat['length'][$key])) {
+    			$part = iconv_substr($number, $key, $parsedformat['length'][$key]);
+    			if (!is_numeric($part)) {
+    				return false;
+    			}
+    		}
+    	}
+    	
+    	return true;
+    }
+    
+    /**
      * Search $number for a month name found in $monthlist, and replace if found.
      *
      * @param  string  $number     Date string (modified)