diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug825966.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug825966.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+datediff = function(date1, date2, interval) {
+    var delta = 1;
+    switch(interval) {
+      case "day":
+	delta /= 24;
+      case "minute":
+	delta /= 60;
+      case Math:
+	break;
+    }
+    return delta;
+};
+
+var diff = datediff(new Date("2012-04-28T14:30:00Z"), new Date("2012-04-29T14:30:00Z"), "day");
+for (var i = 0; i < 50; i++) {
+    diff = datediff(new Date("2012-04-28T17:00:00Z"), new Date("2012-04-28T17:30:00Z"), "minute");
+    assertEq(diff, 1/60);
+}