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diff --git a/ext/date/tests/gmdate_variation13.phpt b/ext/date/tests/gmdate_variation13.phpt
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+++ b/ext/date/tests/gmdate_variation13.phpt
@@ -0,0 +1,82 @@
+--TEST--
+Test gmdate() function : usage variation - Passing predefined constants to format argument.
+--FILE--
+<?php
+/* Prototype  : string gmdate(string format [, long timestamp])
+ * Description: Format a GMT date/time 
+ * Source code: ext/date/php_date.c
+ */
+
+echo "*** Testing gmdate() : usage variation ***\n";
+
+// Initialise all required variables
+date_default_timezone_set('UTC');
+$timestamp = mktime(8, 8, 8, 8, 8, 2008);
+
+//array of values to iterate over
+$inputs = array(
+      // Predefined Date constants
+      'DATE_ATOM Constant' => DATE_ATOM,
+	  'DATE_COOKIE Constant' => DATE_COOKIE,
+	  'DATE_RFC822 Constant' => DATE_RFC822,
+	  'DATE_RFC850 Constant' => DATE_RFC850,
+	  'DATE_RFC1036 Constant' => DATE_RFC1036,
+	  'DATE_RFC1123 Constant' => DATE_RFC1123,
+	  'DATE_RFC2822 Constant' => DATE_RFC2822,
+	  'DATE_RFC3339 Constant' => DATE_RFC3339,
+	  'DATE_RSS Constant' => DATE_RSS,
+	  'DATE_W3C Constant' => DATE_W3C,
+);
+
+// loop through each element of the array for format
+foreach($inputs as $key =>$value) {
+      echo "\n--$key--\n";
+	  var_dump( gmdate($value, $timestamp) );
+	  var_dump( gmdate($value) );
+};
+
+?>
+===DONE===
+--EXPECTF--
+*** Testing gmdate() : usage variation ***
+
+--DATE_ATOM Constant--
+string(25) "2008-08-08T08:08:08+00:00"
+string(%d) "%s"
+
+--DATE_COOKIE Constant--
+string(30) "Friday, 08-Aug-08 08:08:08 GMT"
+string(%d) "%s"
+
+--DATE_RFC822 Constant--
+string(29) "Fri, 08 Aug 08 08:08:08 +0000"
+string(%d) "%s"
+
+--DATE_RFC850 Constant--
+string(30) "Friday, 08-Aug-08 08:08:08 GMT"
+string(%d) "%s"
+
+--DATE_RFC1036 Constant--
+string(29) "Fri, 08 Aug 08 08:08:08 +0000"
+string(%d) "%s"
+
+--DATE_RFC1123 Constant--
+string(31) "Fri, 08 Aug 2008 08:08:08 +0000"
+string(%d) "%s"
+
+--DATE_RFC2822 Constant--
+string(31) "Fri, 08 Aug 2008 08:08:08 +0000"
+string(%d) "%s"
+
+--DATE_RFC3339 Constant--
+string(25) "2008-08-08T08:08:08+00:00"
+string(%d) "%s"
+
+--DATE_RSS Constant--
+string(31) "Fri, 08 Aug 2008 08:08:08 +0000"
+string(%d) "%s"
+
+--DATE_W3C Constant--
+string(25) "2008-08-08T08:08:08+00:00"
+string(%d) "%s"
+===DONE===
+\ No newline at end of file