Fixed the timestamp calculation in seconds

lib/pool.js

@@ -333,7 +333,7 @@ function Miner(id, login, pass, ipAddress, startingDiff, messageSender, protoVer
     // VarDiff System
     this.shareTimeBuffer = global.support.circularBuffer(8);
     this.shareTimeBuffer.enq(global.config.pool.targetTime);
-    this.lastShareTime = Date.now() / 1000 || 0;
+    this.lastShareTime = Math.floor(Date.now() / 1000);
 
     this.validShares = 0;
     this.invalidShares = 0;