Add timeoffset to getinfo RPC call

Provides a method to get the difference between network adjusted time
and local time from the RPC interface.

src/rpcwallet.cpp

@@ -75,6 +75,7 @@ Value getinfo(const Array& params, bool fHelp)
     obj.push_back(Pair("walletversion", pwalletMain->GetVersion()));
     obj.push_back(Pair("balance",       ValueFromAmount(pwalletMain->GetBalance())));
     obj.push_back(Pair("blocks",        (int)nBestHeight));
+    obj.push_back(Pair("timeoffset",    (boost::int64_t)GetTimeOffset()));
     obj.push_back(Pair("connections",   (int)vNodes.size()));
     obj.push_back(Pair("proxy",         (proxy.first.IsValid() ? proxy.first.ToStringIPPort() : string())));
     obj.push_back(Pair("difficulty",    (double)GetDifficulty()));

src/util.cpp

@@ -1203,9 +1203,14 @@ void SetMockTime(int64 nMockTimeIn)
 
 static int64 nTimeOffset = 0;
 
+int64 GetTimeOffset()
+{
+    return nTimeOffset;
+}
+
 int64 GetAdjustedTime()
 {
-    return GetTime() + nTimeOffset;
+    return GetTime() + GetTimeOffset();
 }
 
 void AddTimeData(const CNetAddr& ip, int64 nTime)

src/util.h

@@ -212,6 +212,7 @@ uint256 GetRandHash();
 int64 GetTime();
 void SetMockTime(int64 nMockTimeIn);
 int64 GetAdjustedTime();
+int64 GetTimeOffset();
 std::string FormatFullVersion();
 std::string FormatSubVersion(const std::string& name, int nClientVersion, const std::vector<std::string>& comments);
 void AddTimeData(const CNetAddr& ip, int64 nTime);