diff --git a/lib/carelink/carelinkSimulator.js b/lib/carelink/carelinkSimulator.js
index 0c68dff89a..16252b9910 100644
--- a/lib/carelink/carelinkSimulator.js
+++ b/lib/carelink/carelinkSimulator.js
@@ -70,7 +70,8 @@ function computeMillisInCurrentDay(e){
   // matches a schedule, so we round to the nearest fifteen mins
   // to increase the chance of matching up with a schedule
   if (e.conversionOffset && e.conversionOffset !== 0) {
-    return Math.round(msFromMidnight/fifteenMinsInMs)*fifteenMinsInMs;
+    var result = Math.round(msFromMidnight/fifteenMinsInMs)*fifteenMinsInMs;
+    return result === 864e5 ? 0 : result;
   }
   return msFromMidnight;
 }