diff --git a/themes/doi-theme/layouts/partials/numbers-graphs-js.html b/themes/doi-theme/layouts/partials/numbers-graphs-js.html
index 041ddf6..8b7529a 100644
--- a/themes/doi-theme/layouts/partials/numbers-graphs-js.html
+++ b/themes/doi-theme/layouts/partials/numbers-graphs-js.html
@@ -190,9 +190,7 @@
             both.push([key, monthlyResolutions[key].resolutions ]) ; 
             
             //console.log('adding row');
-            datestring = key + "-01";
-            var dateobj = new Date(datestring);
-            //console.log("datestring= " , datestring);
+            var dateobj = getLastDayOfMonth(datestring);
             data.addRow([dateobj, monthlyResolutions[key].resolutions ]);
                       
           }
@@ -236,6 +234,12 @@
         return;
     }
 
+    function getLastDayOfMonth(monthString) {
+        const [year, month] = monthString.split('-').map(Number);
+        const lastDay = new Date(year, month, 0);
+        return lastDay;
+    }
+
     function renderResolutionsBotPercent(doiResolutions) {
       try {
         let botPercentElement = document.getElementById('bot_percent');
@@ -294,4 +298,4 @@
       }
     }
 
-  </script>
\ No newline at end of file
+  </script>