diff --git a/cdc/api/v2/model_test.go b/cdc/api/v2/model_test.go
index 90db67e51b1..8d74c9e7e8c 100644
--- a/cdc/api/v2/model_test.go
+++ b/cdc/api/v2/model_test.go
@@ -49,7 +49,7 @@ var defaultAPIConfig = &ReplicaConfig{
 		},
 		EncoderConcurrency:       16,
 		Terminator:               config.CRLF,
-		DateSeparator:            config.DateSeparatorNone.String(),
+		DateSeparator:            config.DateSeparatorDay.String(),
 		EnablePartitionSeparator: true,
 	},
 	Consistent: &ConsistentConfig{
diff --git a/cdc/sinkv2/eventsink/cloudstorage/cloud_storage_dml_sink_test.go b/cdc/sinkv2/eventsink/cloudstorage/cloud_storage_dml_sink_test.go
index 81f75769f8e..3639eefbfe7 100644
--- a/cdc/sinkv2/eventsink/cloudstorage/cloud_storage_dml_sink_test.go
+++ b/cdc/sinkv2/eventsink/cloudstorage/cloud_storage_dml_sink_test.go
@@ -122,6 +122,7 @@ func TestCloudStorageWriteEventsWithoutDateSeparator(t *testing.T) {
 	require.Nil(t, err)
 
 	replicaConfig := config.GetDefaultReplicaConfig()
+	replicaConfig.Sink.DateSeparator = config.DateSeparatorNone.String()
 	replicaConfig.Sink.Protocol = config.ProtocolCsv.String()
 	replicaConfig.Sink.FileIndexWidth = 6
 	errCh := make(chan error, 5)
diff --git a/cdc/sinkv2/eventsink/cloudstorage/dml_worker_test.go b/cdc/sinkv2/eventsink/cloudstorage/dml_worker_test.go
index 84f43d0f353..7556fb753f2 100644
--- a/cdc/sinkv2/eventsink/cloudstorage/dml_worker_test.go
+++ b/cdc/sinkv2/eventsink/cloudstorage/dml_worker_test.go
@@ -44,7 +44,9 @@ func testDMLWorker(ctx context.Context, t *testing.T, dir string) *dmlWorker {
 	sinkURI, err := url.Parse(uri)
 	require.Nil(t, err)
 	cfg := cloudstorage.NewConfig()
-	err = cfg.Apply(context.TODO(), sinkURI, config.GetDefaultReplicaConfig())
+	replicaConfig := config.GetDefaultReplicaConfig()
+	replicaConfig.Sink.DateSeparator = config.DateSeparatorNone.String()
+	err = cfg.Apply(context.TODO(), sinkURI, replicaConfig)
 	cfg.FileIndexWidth = 6
 	require.Nil(t, err)
 
diff --git a/pkg/cmd/util/helper_test.go b/pkg/cmd/util/helper_test.go
index 17c1e4f994d..d96ebe9b278 100644
--- a/pkg/cmd/util/helper_test.go
+++ b/pkg/cmd/util/helper_test.go
@@ -201,7 +201,7 @@ func TestAndWriteExampleReplicaTOML(t *testing.T) {
 			NullString: config.NULL,
 		},
 		Terminator:               "\r\n",
-		DateSeparator:            config.DateSeparatorNone.String(),
+		DateSeparator:            config.DateSeparatorDay.String(),
 		EnablePartitionSeparator: true,
 		Protocol:                 "open-protocol",
 	}, cfg.Sink)
diff --git a/pkg/config/replica_config.go b/pkg/config/replica_config.go
index ce289c5f8dc..bc65ce26496 100644
--- a/pkg/config/replica_config.go
+++ b/pkg/config/replica_config.go
@@ -56,7 +56,7 @@ var defaultReplicaConfig = &ReplicaConfig{
 		},
 		EncoderConcurrency:       16,
 		Terminator:               CRLF,
-		DateSeparator:            DateSeparatorNone.String(),
+		DateSeparator:            DateSeparatorDay.String(),
 		EnablePartitionSeparator: true,
 		TiDBSourceID:             1,
 	},
diff --git a/pkg/sink/cloudstorage/config_test.go b/pkg/sink/cloudstorage/config_test.go
index faa38d106f9..994219c74b5 100644
--- a/pkg/sink/cloudstorage/config_test.go
+++ b/pkg/sink/cloudstorage/config_test.go
@@ -36,6 +36,7 @@ func TestConfigApply(t *testing.T) {
 	require.Nil(t, err)
 
 	replicaConfig := config.GetDefaultReplicaConfig()
+	replicaConfig.Sink.DateSeparator = config.DateSeparatorNone.String()
 	err = replicaConfig.ValidateAndAdjust(sinkURI)
 	require.NoError(t, err)
 	cfg := NewConfig()
diff --git a/pkg/sink/cloudstorage/path_test.go b/pkg/sink/cloudstorage/path_test.go
index 2f0b2673ba5..6a0dbe56c4a 100644
--- a/pkg/sink/cloudstorage/path_test.go
+++ b/pkg/sink/cloudstorage/path_test.go
@@ -35,6 +35,7 @@ func testFilePathGenerator(ctx context.Context, t *testing.T, dir string) *FileP
 	sinkURI, err := url.Parse(uri)
 	require.NoError(t, err)
 	replicaConfig := config.GetDefaultReplicaConfig()
+	replicaConfig.Sink.DateSeparator = config.DateSeparatorNone.String()
 	replicaConfig.Sink.Protocol = config.ProtocolOpen.String()
 	replicaConfig.Sink.FileIndexWidth = 6
 	cfg := NewConfig()
diff --git a/tests/integration_tests/api_v2/cases.go b/tests/integration_tests/api_v2/cases.go
index 819fec4eb09..36f7fbe0df9 100644
--- a/tests/integration_tests/api_v2/cases.go
+++ b/tests/integration_tests/api_v2/cases.go
@@ -121,7 +121,7 @@ var defaultReplicaConfig = &ReplicaConfig{
 		},
 		EncoderConcurrency:       16,
 		Terminator:               "\r\n",
-		DateSeparator:            "none",
+		DateSeparator:            "day",
 		EnablePartitionSeparator: true,
 	},
 	Consistent: &ConsistentConfig{