add staking time parameter to prevent staking until 9PM EST for a fai…

…r relaunch of PoS

src/miner.cpp

@@ -493,7 +493,7 @@ void BitcoinMiner(CWallet *pwallet, bool fProofOfStake)
             continue;
         }
 
-        while (vNodes.empty() || pwallet->IsLocked() ||  !fMintableCoins || nReserveBalance >= pwallet->GetBalance() || !masternodeSync.IsSynced())
+        while (chainActive.Tip()->nTime < 1471482000 || vNodes.empty() || pwallet->IsLocked() ||  !fMintableCoins || nReserveBalance >= pwallet->GetBalance() || !masternodeSync.IsSynced())
         {
             nLastCoinStakeSearchInterval = 0;
             MilliSleep(5000);