diff --git a/test/libethereum/BlockchainTestsFiller/bcValidBlockTestFiller.json b/test/libethereum/BlockchainTestsFiller/bcValidBlockTestFiller.json
index 8562cf5e2..4894c713f 100644
--- a/test/libethereum/BlockchainTestsFiller/bcValidBlockTestFiller.json
+++ b/test/libethereum/BlockchainTestsFiller/bcValidBlockTestFiller.json
@@ -1,4 +1,300 @@
 {
+    "timeDiff12" : {
+        "genesisBlockHeader" : {
+            "bloom" : "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "coinbase" : "0x8888f1f195afa192cfee860698584c030f4c9db1",
+            "difficulty" : "231072",
+            "extraData" : "0x42",
+            "gasLimit" : "3141592",
+            "gasUsed" : "0",
+            "mixHash" : "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+            "nonce" : "0x0102030405060708",
+            "number" : "0",
+            "parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
+            "receiptTrie" : "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+            "stateRoot" : "0xf99eb1626cfa6db435c0836235942d7ccaa935f1ae247d3f1c21e495685f903a",
+            "timestamp" : "0x54c98c81",
+            "transactionsTrie" : "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+            "uncleHash" : "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347"
+        },
+        "expect" : {
+            "095e7baea6a6c7c4c2dfeb977efac326af552d87" : {
+                "balance" : "100"
+            }
+        },
+        "pre" : {
+            "a94f5374fce5edbc8e2a8697c15331677e6ebf0b" : {
+                "balance" : "100000000000",
+                "nonce" : "0",
+                "code" : "",
+                "storage": {}
+            },
+            "095e7baea6a6c7c4c2dfeb977efac326af552d87" : {
+                "balance" : "100",
+                "nonce" : "0",
+                "code" : "{ (MSTORE 0 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff) (LOG1 0 32 0) }",
+                "storage": {}
+            }
+        },
+        "blocks" : [
+            {
+                "transactions" : [
+                    {
+                        "data" : "",
+                        "gasLimit" : "50000",
+                        "gasPrice" : "10",
+                        "nonce" : "0",
+                        "secretKey" : "45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8",
+                        "to" : "095e7baea6a6c7c4c2dfeb977efac326af552d87",
+                        "value" : "5000"
+                    }
+                ],
+                "uncleHeaders" : [
+                ]
+            },
+            {
+                "blockHeader" : {
+                    "RelTimestamp" : "12"
+                },
+                "transactions" : [
+                    {
+                        "data" : "",
+                        "gasLimit" : "50000",
+                        "gasPrice" : "10",
+                        "nonce" : "0",
+                        "secretKey" : "45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8",
+                        "to" : "095e7baea6a6c7c4c2dfeb977efac326af552d87",
+                        "value" : "5000"
+                    }
+                ],
+                "uncleHeaders" : [
+                ]
+            }
+        ]
+    },
+
+    "timeDiff13" : {
+        "genesisBlockHeader" : {
+            "bloom" : "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "coinbase" : "0x8888f1f195afa192cfee860698584c030f4c9db1",
+            "difficulty" : "231072",
+            "extraData" : "0x42",
+            "gasLimit" : "3141592",
+            "gasUsed" : "0",
+            "mixHash" : "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+            "nonce" : "0x0102030405060708",
+            "number" : "0",
+            "parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
+            "receiptTrie" : "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+            "stateRoot" : "0xf99eb1626cfa6db435c0836235942d7ccaa935f1ae247d3f1c21e495685f903a",
+            "timestamp" : "0x54c98c81",
+            "transactionsTrie" : "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+            "uncleHash" : "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347"
+        },
+        "expect" : {
+            "095e7baea6a6c7c4c2dfeb977efac326af552d87" : {
+                "balance" : "100"
+            }
+        },
+        "pre" : {
+            "a94f5374fce5edbc8e2a8697c15331677e6ebf0b" : {
+                "balance" : "100000000000",
+                "nonce" : "0",
+                "code" : "",
+                "storage": {}
+            },
+            "095e7baea6a6c7c4c2dfeb977efac326af552d87" : {
+                "balance" : "100",
+                "nonce" : "0",
+                "code" : "{ (MSTORE 0 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff) (LOG1 0 32 0) }",
+                "storage": {}
+            }
+        },
+        "blocks" : [
+            {
+                "transactions" : [
+                    {
+                        "data" : "",
+                        "gasLimit" : "50000",
+                        "gasPrice" : "10",
+                        "nonce" : "0",
+                        "secretKey" : "45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8",
+                        "to" : "095e7baea6a6c7c4c2dfeb977efac326af552d87",
+                        "value" : "5000"
+                    }
+                ],
+                "uncleHeaders" : [
+                ]
+            },
+            {
+                "blockHeader" : {
+                    "RelTimestamp" : "13"
+                },
+                "transactions" : [
+                    {
+                        "data" : "",
+                        "gasLimit" : "50000",
+                        "gasPrice" : "10",
+                        "nonce" : "0",
+                        "secretKey" : "45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8",
+                        "to" : "095e7baea6a6c7c4c2dfeb977efac326af552d87",
+                        "value" : "5000"
+                    }
+                ],
+                "uncleHeaders" : [
+                ]
+            }
+        ]
+    },
+
+    "timeDiff14" : {
+        "genesisBlockHeader" : {
+            "bloom" : "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "coinbase" : "0x8888f1f195afa192cfee860698584c030f4c9db1",
+            "difficulty" : "231072",
+            "extraData" : "0x42",
+            "gasLimit" : "3141592",
+            "gasUsed" : "0",
+            "mixHash" : "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+            "nonce" : "0x0102030405060708",
+            "number" : "0",
+            "parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
+            "receiptTrie" : "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+            "stateRoot" : "0xf99eb1626cfa6db435c0836235942d7ccaa935f1ae247d3f1c21e495685f903a",
+            "timestamp" : "0x54c98c81",
+            "transactionsTrie" : "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+            "uncleHash" : "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347"
+        },
+        "expect" : {
+            "095e7baea6a6c7c4c2dfeb977efac326af552d87" : {
+                "balance" : "100"
+            }
+        },
+        "pre" : {
+            "a94f5374fce5edbc8e2a8697c15331677e6ebf0b" : {
+                "balance" : "100000000000",
+                "nonce" : "0",
+                "code" : "",
+                "storage": {}
+            },
+            "095e7baea6a6c7c4c2dfeb977efac326af552d87" : {
+                "balance" : "100",
+                "nonce" : "0",
+                "code" : "{ (MSTORE 0 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff) (LOG1 0 32 0) }",
+                "storage": {}
+            }
+        },
+        "blocks" : [
+            {
+                "transactions" : [
+                    {
+                        "data" : "",
+                        "gasLimit" : "50000",
+                        "gasPrice" : "10",
+                        "nonce" : "0",
+                        "secretKey" : "45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8",
+                        "to" : "095e7baea6a6c7c4c2dfeb977efac326af552d87",
+                        "value" : "5000"
+                    }
+                ],
+                "uncleHeaders" : [
+                ]
+            },
+            {
+                "blockHeader" : {
+                    "RelTimestamp" : "14"
+                },
+                "transactions" : [
+                    {
+                        "data" : "",
+                        "gasLimit" : "50000",
+                        "gasPrice" : "10",
+                        "nonce" : "0",
+                        "secretKey" : "45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8",
+                        "to" : "095e7baea6a6c7c4c2dfeb977efac326af552d87",
+                        "value" : "5000"
+                    }
+                ],
+                "uncleHeaders" : [
+                ]
+            }
+        ]
+    },
+
+    "timeDiff0" : {
+        "genesisBlockHeader" : {
+            "bloom" : "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+            "coinbase" : "0x8888f1f195afa192cfee860698584c030f4c9db1",
+            "difficulty" : "231072",
+            "extraData" : "0x42",
+            "gasLimit" : "3141592",
+            "gasUsed" : "0",
+            "mixHash" : "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+            "nonce" : "0x0102030405060708",
+            "number" : "0",
+            "parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
+            "receiptTrie" : "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+            "stateRoot" : "0xf99eb1626cfa6db435c0836235942d7ccaa935f1ae247d3f1c21e495685f903a",
+            "timestamp" : "0x54c98c81",
+            "transactionsTrie" : "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+            "uncleHash" : "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347"
+        },
+        "expect" : {
+            "095e7baea6a6c7c4c2dfeb977efac326af552d87" : {
+                "balance" : "100"
+            }
+        },
+        "pre" : {
+            "a94f5374fce5edbc8e2a8697c15331677e6ebf0b" : {
+                "balance" : "100000000000",
+                "nonce" : "0",
+                "code" : "",
+                "storage": {}
+            },
+            "095e7baea6a6c7c4c2dfeb977efac326af552d87" : {
+                "balance" : "100",
+                "nonce" : "0",
+                "code" : "{ (MSTORE 0 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff) (LOG1 0 32 0) }",
+                "storage": {}
+            }
+        },
+        "blocks" : [
+            {
+                "transactions" : [
+                    {
+                        "data" : "",
+                        "gasLimit" : "50000",
+                        "gasPrice" : "10",
+                        "nonce" : "0",
+                        "secretKey" : "45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8",
+                        "to" : "095e7baea6a6c7c4c2dfeb977efac326af552d87",
+                        "value" : "5000"
+                    }
+                ],
+                "uncleHeaders" : [
+                ]
+            },
+            {
+                "blockHeader" : {
+                    "RelTimestamp" : "0"
+                },
+                "transactions" : [
+                    {
+                        "data" : "",
+                        "gasLimit" : "50000",
+                        "gasPrice" : "10",
+                        "nonce" : "0",
+                        "secretKey" : "45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8",
+                        "to" : "095e7baea6a6c7c4c2dfeb977efac326af552d87",
+                        "value" : "5000"
+                    }
+                ],
+                "uncleHeaders" : [
+                ]
+            }
+        ]
+    },
+
     "diff1024" : {
         "genesisBlockHeader" : {
             "bloom" : "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
diff --git a/test/libethereum/blockchain.cpp b/test/libethereum/blockchain.cpp
index efe6585ad..ce06a1749 100644
--- a/test/libethereum/blockchain.cpp
+++ b/test/libethereum/blockchain.cpp
@@ -46,7 +46,7 @@ RLPStream createFullBlockFromHeader(BlockHeader const& _bi, bytes const& _txs =
 
 mArray writeTransactionsToJson(Transactions const& txs);
 mObject writeBlockHeaderToJson(mObject& _o, BlockHeader const& _bi);
-void overwriteBlockHeader(BlockHeader& _current_BlockHeader, mObject& _blObj);
+void overwriteBlockHeader(BlockHeader& _current_BlockHeader, mObject& _blObj, const BlockHeader& _parent);
 void updatePoW(BlockHeader& _bi);
 mArray importUncles(mObject const& _blObj, vector<BlockHeader>& _vBiUncles, vector<BlockHeader> const& _vBiBlocks, std::vector<blockSet> _blockSet);
 
@@ -223,7 +223,7 @@ void doBlockchainTests(json_spirit::mValue& _v, bool _fillin)
 				}
 
 				if (blObj.count("blockHeader"))
-					overwriteBlockHeader(current_BlockHeader, blObj);
+					overwriteBlockHeader(current_BlockHeader, blObj, vBiBlocks[vBiBlocks.size()-1]);
 
 				if (blObj.count("blockHeader") && blObj["blockHeader"].get_obj().count("bruncle"))
 					current_BlockHeader.populateFromParent(vBiBlocks[vBiBlocks.size() -1]);
@@ -664,7 +664,7 @@ bytes createBlockRLPFromFields(mObject& _tObj, h256 const& _stateRoot)
 	return rlpStream.out();
 }
 
-void overwriteBlockHeader(BlockHeader& _header, mObject& _blObj)
+void overwriteBlockHeader(BlockHeader& _header, mObject& _blObj, BlockHeader const& _parent)
 {
 	auto ho = _blObj["blockHeader"].get_obj();
 	if (ho.size() != 14)
@@ -684,6 +684,13 @@ void overwriteBlockHeader(BlockHeader& _header, mObject& _blObj)
 			ho.count("timestamp") ? toInt(ho["timestamp"]) : _header.timestamp(),
 			ho.count("extraData") ? importByteArray(ho["extraData"].get_str()) : _header.extraData());
 
+		if (ho.count("RelTimestamp"))
+		{
+			tmp.setTimestamp(toInt(ho["RelTimestamp"]) +_parent.timestamp());
+			tmp.setDifficulty(tmp.calculateDifficulty(_parent));
+			this_thread::sleep_for(chrono::seconds((int)toInt(ho["RelTimestamp"])));
+		}
+
 		// find new valid nonce
 		if (static_cast<BlockInfo>(tmp) != static_cast<BlockInfo>(_header) && tmp.difficulty())
 			mine(tmp);