diff --git a/cdc/api/v2/model_test.go b/cdc/api/v2/model_test.go
index db0c57fa696..7b6b40ca70d 100644
--- a/cdc/api/v2/model_test.go
+++ b/cdc/api/v2/model_test.go
@@ -51,7 +51,7 @@ var defaultAPIConfig = &ReplicaConfig{
 		},
 		EncoderConcurrency:       util.AddressOf(16),
 		Terminator:               util.AddressOf(config.CRLF),
-		DateSeparator:            util.AddressOf(config.DateSeparatorNone.String()),
+		DateSeparator:            util.AddressOf(config.DateSeparatorDay.String()),
 		EnablePartitionSeparator: util.AddressOf(true),
 		EnableKafkaSinkV2:        util.AddressOf(false),
 		OnlyOutputUpdatedColumns: util.AddressOf(false),
diff --git a/pkg/cmd/util/helper_test.go b/pkg/cmd/util/helper_test.go
index 8cfbe421036..df5b9aded6c 100644
--- a/pkg/cmd/util/helper_test.go
+++ b/pkg/cmd/util/helper_test.go
@@ -206,7 +206,7 @@ func TestAndWriteExampleReplicaTOML(t *testing.T) {
 			NullString: config.NULL,
 		},
 		Terminator:               util.AddressOf("\r\n"),
-		DateSeparator:            util.AddressOf(config.DateSeparatorNone.String()),
+		DateSeparator:            util.AddressOf(config.DateSeparatorDay.String()),
 		EnablePartitionSeparator: util.AddressOf(true),
 		EnableKafkaSinkV2:        util.AddressOf(false),
 		OnlyOutputUpdatedColumns: util.AddressOf(false),
diff --git a/pkg/config/config_test_data.go b/pkg/config/config_test_data.go
index e147693cf45..055d34cdb49 100644
--- a/pkg/config/config_test_data.go
+++ b/pkg/config/config_test_data.go
@@ -37,7 +37,7 @@ const (
   "sink": {
     "encoder-concurrency": 16,
     "terminator": "\r\n",
-	"date-separator": "none",
+	"date-separator": "day",
     "dispatch-rules": [
       {
         "db-name": "a",
diff --git a/pkg/config/replica_config.go b/pkg/config/replica_config.go
index 861ca2b7994..4aecd9d0c7a 100644
--- a/pkg/config/replica_config.go
+++ b/pkg/config/replica_config.go
@@ -61,7 +61,7 @@ var defaultReplicaConfig = &ReplicaConfig{
 		},
 		EncoderConcurrency:       util.AddressOf(16),
 		Terminator:               util.AddressOf(CRLF),
-		DateSeparator:            util.AddressOf(DateSeparatorNone.String()),
+		DateSeparator:            util.AddressOf(DateSeparatorDay.String()),
 		EnablePartitionSeparator: util.AddressOf(true),
 		EnableKafkaSinkV2:        util.AddressOf(false),
 		OnlyOutputUpdatedColumns: util.AddressOf(false),
diff --git a/pkg/sink/cloudstorage/config_test.go b/pkg/sink/cloudstorage/config_test.go
index f2faefbc3f0..e6a5d3966f1 100644
--- a/pkg/sink/cloudstorage/config_test.go
+++ b/pkg/sink/cloudstorage/config_test.go
@@ -21,7 +21,6 @@ import (
 
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/pingcap/tiflow/pkg/config"
-	"github.com/pingcap/tiflow/pkg/util"
 	"github.com/stretchr/testify/require"
 )
 
@@ -31,14 +30,13 @@ func TestConfigApply(t *testing.T) {
 	expected.FlushInterval = 10 * time.Second
 	expected.FileSize = 16 * 1024 * 1024
 	expected.FileIndexWidth = config.DefaultFileIndexWidth
-	expected.DateSeparator = config.DateSeparatorNone.String()
+	expected.DateSeparator = config.DateSeparatorDay.String()
 	expected.EnablePartitionSeparator = true
 	uri := "s3://bucket/prefix?worker-count=32&flush-interval=10s&file-size=16777216&protocol=csv"
 	sinkURI, err := url.Parse(uri)
 	require.Nil(t, err)
 
 	replicaConfig := config.GetDefaultReplicaConfig()
-	replicaConfig.Sink.DateSeparator = util.AddressOf(config.DateSeparatorNone.String())
 	err = replicaConfig.ValidateAndAdjust(sinkURI)
 	require.NoError(t, err)
 	cfg := NewConfig()