diff --git a/phpgwapi/js/jscalendar/calendar.js b/phpgwapi/js/jscalendar/calendar.js
index 53bca46034..3c60ba18f2 100644
--- a/phpgwapi/js/jscalendar/calendar.js
+++ b/phpgwapi/js/jscalendar/calendar.js
@@ -1732,7 +1732,7 @@ Date.prototype.print = function (str) {
 	s["%%"] = "%";		// a literal '%' character
 
 	var re = /%./g;
-	if (!Calendar.is_ie5)
+	if (!Calendar.is_ie5 && !Calendar.is_opera)
 		return str.replace(re, function (par) { return s[par] || par; });
 
 	var a = str.match(re);