diff --git a/index.js b/index.js
index c2d6c04..0a7dcce 100644
--- a/index.js
+++ b/index.js
@@ -86,14 +86,15 @@ function getSystemUptime() {
  */
 function updateRecords(callStats, records) {
     const yesterday = getYesterday().startDate;
+    const yesterdayDateString = yesterday.toISOString().split('T')[0];
     let isNewRecord = false;
 
     // Update all-time record
-    const allTimeRecord = records.callRecord || new CallRecord({ date: yesterday, count: 0 });
+    const allTimeRecord = records.callRecord || new CallRecord({ date: yesterdayDateString, count: 0 });
     if (!records.callRecord) {
-        records.callRecord = { date: currentDate, count: callStats.totalCallsMade };
+        records.callRecord = { date: yesterdayDateString, count: callStats.totalCallsMade };
         isNewRecord = true;
-    } else if (parseInt(allTimeRecord.count) < callStats.totalCallsThisMonth) {
+    } else if (allTimeRecord.count < callStats.totalCallsThisMonth) {
         allTimeRecord.count = callStats.totalCallsThisMonth;
         isNewRecord = true;
     }