diff --git a/static/js/graphing.js b/static/js/graphing.js
index e179ff1cc..4ed68ab16 100644
--- a/static/js/graphing.js
+++ b/static/js/graphing.js
@@ -1126,7 +1126,12 @@ LogUsageChart.prototype.buildData_ = function(aggregatedLogs) {
     var title = this.titleMap_[aggregated.kind] || aggregated.kind;
     var datetime = parseDate(aggregated.datetime);
 
-    var formatted = (datetime.getMonth() + 1) + '/' + datetime.getDate();
+    var day = datetime.getDate();
+    if (day < 10) {
+      day = '0' + day;
+    }
+
+    var formatted = (datetime.getMonth() + 1) + '/' + day;
     var justdate = new Date(datetime.getFullYear(), datetime.getMonth(), datetime.getDate());
     var key = title + '_' + formatted;
     var entry = {
@@ -1205,10 +1210,6 @@ LogUsageChart.prototype.buildData_ = function(aggregatedLogs) {
  * Renders the tooltip when hovering over an element in the chart.
  */
 LogUsageChart.prototype.renderTooltip_ = function(d, e) {
-  if (e[0] == '0') {
-    e = e.substr(1);
-  }
-
   var key = d + '_' + e;
   var entry = this.entryMap_[key];
   if (!entry) {