diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
index ae5894e3..ed616f40 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
@@ -240,7 +240,6 @@ public class MpMasterService extends Service {
         intentFilter = new IntentFilter(SimUtil.SMS_SEND_ACTION);
         registerReceiver(mSmsSnedReceiver, intentFilter);
 
-
         // AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
 
         // startMaster(false);
@@ -553,40 +552,35 @@ public class MpMasterService extends Service {
             timeout = mQuickHeartbeatDuration;
             registerHeartbeatTimer(SystemClock.elapsedRealtime() + timeout * 1000);
         } else {
-            long closestTime = 0;
+            long closestTime = -1;
             if (mAbsHeartbeatTimes != null && mAbsHeartbeatTimes.length > 0) {
-                long currentTimeMillis = System.currentTimeMillis();
-                long heartTimeMills = currentTimeMillis + timeout * 1000;
-
                 Date dt = new Date();
-                for (int i = 0; i < mAbsHeartbeatTimes.length; i++) {
-                    int mAbsHeartbeatTime = mAbsHeartbeatTimes[i];
-                    int hour = mAbsHeartbeatTime / 60;
-                    int minute = mAbsHeartbeatTime % 60;
-                    if (hour >= 24) {
-                        continue;
-                    }
+                long ts = dt.getTime();
+                ts -= ts % 1000;
 
-                    dt.setHours(hour);
-                    dt.setMinutes(minute);
-                    dt.setSeconds(0);
+                dt.setHours(0);
+                dt.setMinutes(0);
+                dt.setSeconds(0);
 
-                    long selecttime = dt.getTime();
-                    if (selecttime > currentTimeMillis && selecttime < heartTimeMills) {
-                        closestTime = selecttime;
+                long zeroPoint = dt.getTime();
+                zeroPoint -= zeroPoint % 1000;
+
+                long offsetTs = (ts - zeroPoint) / 1000;
+                for (int i = 0; i < mAbsHeartbeatTimes.length; i++) {
+                    if (mAbsHeartbeatTimes[i] >= offsetTs) {
+                        closestTime = mAbsHeartbeatTimes[i];
                         break;
-                    } else {
-                        if (i == (mAbsHeartbeatTimes.length - 1)) {
-                            closestTime = heartTimeMills;
-                        }
                     }
                 }
 
-                if (closestTime > 0) {
-                    registerAbsHeartbeatTimer(closestTime);
+                if (closestTime == -1) {
+                    // next day
+                    closestTime = mAbsHeartbeatTimes[0] + 86400;
                 }
+
+                registerAbsHeartbeatTimer(zeroPoint + closestTime * 1000);
             } else {
-                registerHeartbeatTimer(SystemClock.elapsedRealtime() + timeout * 1000);
+                registerHeartbeatTimer(System.currentTimeMillis() + timeout * 1000);
             }
         }
     }