diff --git a/lightningd/channel.c b/lightningd/channel.c
index baddbe20c..7d0d93175 100644
--- a/lightningd/channel.c
+++ b/lightningd/channel.c
@@ -430,6 +430,7 @@ void channel_set_state(struct channel *channel,
 		       char *why)
 {
 	struct channel_id cid;
+	struct timeabs timestamp;
 
 	/* set closer, if known */
 	if (state > CHANNELD_NORMAL && channel->closer == NUM_SIDES) {
@@ -457,11 +458,13 @@ void channel_set_state(struct channel *channel,
 
 	/* plugin notification channel_state_changed */
 	if (state != old_state) {  /* see issue #4029 */
+		timestamp = time_now();
 		derive_channel_id(&cid, &channel->funding_txid, channel->funding_outnum);
 		notify_channel_state_changed(channel->peer->ld,
 					     &channel->peer->id,
 					     &cid,
 					     channel->scid,
+					     &timestamp,
 					     old_state,
 					     state,
 					     reason,
diff --git a/lightningd/notification.c b/lightningd/notification.c
index d0a22f3cd..afb4dd2b1 100644
--- a/lightningd/notification.c
+++ b/lightningd/notification.c
@@ -214,6 +214,7 @@ static void channel_state_changed_notification_serialize(struct json_stream *str
 							 struct node_id *peer_id,
 							 struct channel_id *cid,
 							 struct short_channel_id *scid,
+							 struct timeabs *timestamp,
 							 enum channel_state old_state,
 							 enum channel_state new_state,
 							 enum state_change cause,
@@ -226,6 +227,7 @@ static void channel_state_changed_notification_serialize(struct json_stream *str
 		json_add_short_channel_id(stream, "short_channel_id", scid);
 	else
 		json_add_null(stream, "short_channel_id");
+	json_add_timeiso(stream, "timestamp", timestamp);
 	json_add_string(stream, "old_state", channel_state_str(old_state));
 	json_add_string(stream, "new_state", channel_state_str(new_state));
 	json_add_string(stream, "cause", channel_change_state_reason_str(cause));
@@ -244,6 +246,7 @@ void notify_channel_state_changed(struct lightningd *ld,
 				  struct node_id *peer_id,
 				  struct channel_id *cid,
 				  struct short_channel_id *scid,
+				  struct timeabs *timestamp,
 				  enum channel_state old_state,
 				  enum channel_state new_state,
 				  enum state_change cause,
@@ -253,6 +256,7 @@ void notify_channel_state_changed(struct lightningd *ld,
 			  struct node_id *,
 			  struct channel_id *,
 			  struct short_channel_id *,
+			  struct timeabs *timestamp,
 			  enum channel_state,
 			  enum channel_state,
 			  enum state_change,
@@ -260,7 +264,7 @@ void notify_channel_state_changed(struct lightningd *ld,
 
 	struct jsonrpc_notification *n
 		= jsonrpc_notification_start(NULL, channel_state_changed_notification_gen.topic);
-	serialize(n->stream, peer_id, cid, scid, old_state, new_state, cause, message);
+	serialize(n->stream, peer_id, cid, scid, timestamp, old_state, new_state, cause, message);
 	jsonrpc_notification_end(n);
 	plugins_notify(ld->plugins, take(n));
 }
diff --git a/lightningd/notification.h b/lightningd/notification.h
index 44a62a0a4..1b423bf3f 100644
--- a/lightningd/notification.h
+++ b/lightningd/notification.h
@@ -63,6 +63,7 @@ void notify_channel_state_changed(struct lightningd *ld,
 				  struct node_id *peer_id,
 				  struct channel_id *cid,
 				  struct short_channel_id *scid,
+				  struct timeabs *timestamp,
 				  enum channel_state old_state,
 				  enum channel_state new_state,
 				  enum state_change cause,
diff --git a/tests/test_plugin.py b/tests/test_plugin.py
index b8897dccc..16a977805 100644
--- a/tests/test_plugin.py
+++ b/tests/test_plugin.py
@@ -1,4 +1,5 @@
 from collections import OrderedDict
+from datetime import datetime
 from fixtures import *  # noqa: F401,F403
 from flaky import flaky  # noqa: F401
 from hashlib import sha256
@@ -668,6 +669,10 @@ def test_channel_state_changed_bilateral(node_factory, bitcoind):
     assert(event2['cause'] == "remote")
     assert(event2['message'] == "Lockin complete")
 
+    # also test the correctness of timestamps once
+    assert(datetime.fromisoformat(event1['timestamp'].replace('Z', '+00:00')))
+    assert(datetime.fromisoformat(event2['timestamp'].replace('Z', '+00:00')))
+
     # close channel and look for stateful events
     l1.rpc.close(scid)
 
diff --git a/wallet/db_postgres_sqlgen.c b/wallet/db_postgres_sqlgen.c
index 51a972333..d29fb6104 100644
--- a/wallet/db_postgres_sqlgen.c
+++ b/wallet/db_postgres_sqlgen.c
@@ -1672,4 +1672,4 @@ struct db_query db_postgres_queries[] = {
 
 #endif /* LIGHTNINGD_WALLET_GEN_DB_POSTGRES */
 
-// SHA256STAMP:e101a44fa0daaa4c1118759cc19d3b1b31dedfe85cf0cf3502bd41f939e55634
+// SHA256STAMP:5f01b4eb0c1df3e18b6d3f7af23a509d584b12b8b0a637451576d2ef80bed04f
diff --git a/wallet/db_sqlite3_sqlgen.c b/wallet/db_sqlite3_sqlgen.c
index 5ff1b040d..c82e81b81 100644
--- a/wallet/db_sqlite3_sqlgen.c
+++ b/wallet/db_sqlite3_sqlgen.c
@@ -1672,4 +1672,4 @@ struct db_query db_sqlite3_queries[] = {
 
 #endif /* LIGHTNINGD_WALLET_GEN_DB_SQLITE3 */
 
-// SHA256STAMP:e101a44fa0daaa4c1118759cc19d3b1b31dedfe85cf0cf3502bd41f939e55634
+// SHA256STAMP:5f01b4eb0c1df3e18b6d3f7af23a509d584b12b8b0a637451576d2ef80bed04f
diff --git a/wallet/statements_gettextgen.po b/wallet/statements_gettextgen.po
index 737544f75..6dc65f699 100644
--- a/wallet/statements_gettextgen.po
+++ b/wallet/statements_gettextgen.po
@@ -1098,7 +1098,7 @@ msgstr ""
 msgid "not a valid SQL statement"
 msgstr ""
 
-#: wallet/test/run-wallet.c:1370
+#: wallet/test/run-wallet.c:1371
 msgid "INSERT INTO channels (id) VALUES (1);"
 msgstr ""
-#  SHA256STAMP:0c250c26e1bcb07604d3665155ac7b6edd68904f0cb536b8ccbd0191582d75d5
+#  SHA256STAMP:50d91c4404011657ae39cf1d961cee3c2c313af63ac8ef1cd915bbb7a9973c09
diff --git a/wallet/test/run-wallet.c b/wallet/test/run-wallet.c
index 309275429..0dbffb093 100644
--- a/wallet/test/run-wallet.c
+++ b/wallet/test/run-wallet.c
@@ -442,6 +442,7 @@ void notify_channel_state_changed(struct lightningd *ld UNNEEDED,
 				  struct node_id *peer_id UNNEEDED,
 				  struct channel_id *cid UNNEEDED,
 				  struct short_channel_id *scid UNNEEDED,
+				  struct timeabs *timestamp UNNEEDED,
 				  enum channel_state old_state UNNEEDED,
 				  enum channel_state new_state UNNEEDED,
 				  enum state_change cause UNNEEDED,