diff --git a/consensus/clique/clique.go b/consensus/clique/clique.go
index e9db5be56ad4..cd6e29f57fde 100644
--- a/consensus/clique/clique.go
+++ b/consensus/clique/clique.go
@@ -21,13 +21,14 @@ import (
 	"bytes"
 	"errors"
 	"fmt"
-	"github.com/ethereum/go-ethereum/metrics"
 	"io"
 	"math/big"
 	"math/rand"
 	"sync"
 	"time"
 
+	"github.com/ethereum/go-ethereum/metrics"
+
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
@@ -255,7 +256,7 @@ func (c *Clique) verifyHeader(chain consensus.ChainHeaderReader, header *types.H
 	number := header.Number.Uint64()
 
 	// Don't waste time checking blocks from the future
-	if header.Time > uint64(time.Now().Unix()) {
+	if header.Time > uint64(time.Now().UnixMilli()) {
 		return consensus.ErrFutureBlock
 	}
 	// Checkpoint blocks need to enforce zero beneficiary
@@ -346,7 +347,7 @@ func (c *Clique) verifyCascadingFields(chain consensus.ChainHeaderReader, header
 	if parent == nil || parent.Number.Uint64() != number-1 || parent.Hash() != header.ParentHash {
 		return consensus.ErrUnknownAncestor
 	}
-	if parent.Time+c.config.PeriodMs/1000 > header.Time {
+	if parent.Time+c.config.PeriodMs > header.Time {
 		return errInvalidTimestamp
 	}
 	// Verify that the gasUsed is <= gasLimit
@@ -575,9 +576,10 @@ func (c *Clique) Prepare(chain consensus.ChainHeaderReader, header *types.Header
 	if parent == nil {
 		return consensus.ErrUnknownAncestor
 	}
-	header.Time = parent.Time + c.config.PeriodMs/1000
-	if header.Time < uint64(time.Now().Unix()) {
-		header.Time = uint64(time.Now().Unix())
+
+	header.Time = parent.Time + c.config.PeriodMs
+	if header.Time < uint64(time.Now().UnixMilli()) {
+		header.Time = uint64(time.Now().UnixMilli())
 	}
 	return nil
 }
@@ -657,7 +659,7 @@ func (c *Clique) Seal(chain consensus.ChainHeaderReader, block *types.Block, res
 		}
 	}
 	// Sweet, the protocol permits us to sign the block, wait for our time
-	delay := time.Unix(int64(header.Time), 0).Sub(time.Now()) // nolint: gosimple
+	delay := time.UnixMilli(int64(header.Time)).Sub(time.Now()) // nolint: gosimple
 	if header.Difficulty.Cmp(diffNoTurn) == 0 {
 		// It's not our turn explicitly to sign, delay it a bit
 		wiggle := time.Duration(len(snap.Signers)/2+1) * wiggleTime
diff --git a/geth-poa/genesis.json b/geth-poa/genesis.json
index a3696f308707..a3653833e99d 100644
--- a/geth-poa/genesis.json
+++ b/geth-poa/genesis.json
@@ -20,7 +20,7 @@
       }
     },
     "nonce": "0x0",
-    "timestamp": "0x6546df6d",
+    "timestamp": "0x18E0A4E0D22",
     "extraData": "0x0000000000000000000000000000000000000000000000000000000000000000d9cd8E5DE6d55f796D980B818D350C0746C25b97788EBABe5c3dD422Ef92Ca6714A69e2eabcE1Ee4f6ba5bca9b489de3a4ac3a57823d5d97d608feb90000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
     "gasLimit": "0x1c9c380",
     "difficulty": "0x1",