diff --git a/libi2pd/NTCP2.cpp b/libi2pd/NTCP2.cpp
index f78999be..f2bdc466 100644
--- a/libi2pd/NTCP2.cpp
+++ b/libi2pd/NTCP2.cpp
@@ -139,7 +139,7 @@ namespace transport
 		m3p2[3] = 0; // flag
 		memcpy (m3p2 + 4, i2p::context.GetRouterInfo ().GetBuffer (), bufLen); // TODO: own RI should be protected by mutex
 		// 2 bytes reserved
-		htobe32buf (options + 8, i2p::util::GetSecondsSinceEpoch ()); // tsA
+		htobe32buf (options + 8, (i2p::util::GetMillisecondsSinceEpoch () + 500)/1000); // tsA, rounded to seconds
 		// 4 bytes reserved
 		// sign and encrypt options, use m_H as AD
 		uint8_t nonce[12];
@@ -162,7 +162,7 @@ namespace transport
 		uint8_t options[16];
 		memset (options, 0, 16);
 		htobe16buf (options + 2, paddingLen); // padLen
-		htobe32buf (options + 8, i2p::util::GetSecondsSinceEpoch ()); // tsB
+		htobe32buf (options + 8, (i2p::util::GetMillisecondsSinceEpoch () + 500)/1000); // tsB, rounded to seconds
 		// sign and encrypt options, use m_H as AD
 		uint8_t nonce[12];
 		memset (nonce, 0, 12); // set nonce to zero
diff --git a/libi2pd/SSU2Session.cpp b/libi2pd/SSU2Session.cpp
index 85c91f71..aedf346c 100644
--- a/libi2pd/SSU2Session.cpp
+++ b/libi2pd/SSU2Session.cpp
@@ -570,7 +570,7 @@ namespace transport
 		// payload
 		payload[0] = eSSU2BlkDateTime;
 		htobe16buf (payload + 1, 4);
-		htobe32buf (payload + 3, ts/1000);
+		htobe32buf (payload + 3, (ts + 500)/1000);
 		size_t payloadSize = 7;
 		if (GetRouterStatus () == eRouterStatusFirewalled && m_Address->IsIntroducer ())
 		{
@@ -684,7 +684,7 @@ namespace transport
 		size_t maxPayloadSize = m_MaxPayloadSize - 48;
 		payload[0] = eSSU2BlkDateTime;
 		htobe16buf (payload + 1, 4);
-		htobe32buf (payload + 3, ts/1000);
+		htobe32buf (payload + 3, (ts + 500)/1000);
 		size_t payloadSize = 7;
 		payloadSize += CreateAddressBlock (payload + payloadSize, maxPayloadSize - payloadSize, m_RemoteEndpoint);
 		if (m_RelayTag)
@@ -1046,7 +1046,7 @@ namespace transport
 		// payload
 		payload[0] = eSSU2BlkDateTime;
 		htobe16buf (payload + 1, 4);
-		htobe32buf (payload + 3, i2p::util::GetSecondsSinceEpoch ());
+		htobe32buf (payload + 3, (i2p::util::GetMillisecondsSinceEpoch () + 500)/1000);
 		size_t payloadSize = 7;
 		payloadSize += CreatePaddingBlock (payload + payloadSize, 25 - payloadSize, 1);
 		// encrypt
@@ -1117,7 +1117,7 @@ namespace transport
 		// payload
 		payload[0] = eSSU2BlkDateTime;
 		htobe16buf (payload + 1, 4);
-		htobe32buf (payload + 3, i2p::util::GetSecondsSinceEpoch ());
+		htobe32buf (payload + 3, (i2p::util::GetMillisecondsSinceEpoch () + 500)/1000);
 		size_t payloadSize = 7;
 		payloadSize += CreateAddressBlock (payload + payloadSize, 56 - payloadSize, m_RemoteEndpoint);
 		if (m_TerminationReason != eSSU2TerminationReasonNormalClose)
@@ -1205,7 +1205,7 @@ namespace transport
 		// payload
 		payload[0] = eSSU2BlkDateTime;
 		htobe16buf (payload + 1, 4);
-		htobe32buf (payload + 3, i2p::util::GetSecondsSinceEpoch ());
+		htobe32buf (payload + 3, (i2p::util::GetMillisecondsSinceEpoch () + 500)/1000);
 		size_t payloadSize = 7;
 		payloadSize += CreateAddressBlock (payload + payloadSize, m_MaxPayloadSize - payloadSize, ep);
 		payloadSize += CreateRelayResponseBlock (payload + payloadSize, m_MaxPayloadSize - payloadSize,
@@ -1281,7 +1281,7 @@ namespace transport
 		// payload
 		payload[0] = eSSU2BlkDateTime;
 		htobe16buf (payload + 1, 4);
-		htobe32buf (payload + 3, i2p::util::GetSecondsSinceEpoch ());
+		htobe32buf (payload + 3, (i2p::util::GetMillisecondsSinceEpoch () + 500)/1000);
 		size_t payloadSize = 7;
 		if (msg == 6 || msg == 7)
 			payloadSize += CreateAddressBlock (payload + payloadSize, m_MaxPayloadSize - payloadSize, m_RemoteEndpoint);