diff --git a/static/js/graphing.js b/static/js/graphing.js
index 4ed68ab16..ec62ac378 100644
--- a/static/js/graphing.js
+++ b/static/js/graphing.js
@@ -1126,12 +1126,10 @@ LogUsageChart.prototype.buildData_ = function(aggregatedLogs) {
     var title = this.titleMap_[aggregated.kind] || aggregated.kind;
     var datetime = parseDate(aggregated.datetime);
 
-    var day = datetime.getDate();
-    if (day < 10) {
-      day = '0' + day;
-    }
+    var day = ('0' + datetime.getDate()).slice(-2);
+    var month = ('0' + (datetime.getMonth() + 1)).slice(-2);
 
-    var formatted = (datetime.getMonth() + 1) + '/' + day;
+    var formatted = month + '/' + day;
     var justdate = new Date(datetime.getFullYear(), datetime.getMonth(), datetime.getDate());
     var key = title + '_' + formatted;
     var entry = {