fixes angular#2275

if "offset" is not specified, it messes up the calculations that follow. Apparently, it does not default to 0 in arithmetic context on some older browsers.

Author: thiloplanz

src/ng/filter/filters.js

@@ -192,6 +192,7 @@ function padNumber(num, digits, trim) {
 
 
 function dateGetter(name, size, offset, trim) {
+  if (!offset) { offset = 0; }
   return function(date) {
     var value = date['get' + name]();
     if (offset > 0 || value > -offset)