diff --git a/cosid-core/src/test/java/me/ahoo/cosid/segment/grouped/date/YearMonthDayGroupBySupplierTest.java b/cosid-core/src/test/java/me/ahoo/cosid/segment/grouped/date/YearMonthDayGroupBySupplierTest.java
index bb42eb9950..1b00277d4c 100644
--- a/cosid-core/src/test/java/me/ahoo/cosid/segment/grouped/date/YearMonthDayGroupBySupplierTest.java
+++ b/cosid-core/src/test/java/me/ahoo/cosid/segment/grouped/date/YearMonthDayGroupBySupplierTest.java
@@ -17,7 +17,6 @@
 import org.junit.jupiter.api.Test;
 
 import java.time.LocalDate;
-import java.time.YearMonth;
 import java.time.format.DateTimeFormatter;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -34,7 +33,7 @@ void get() {
 
     @Test
     void getYyMm() {
-        String pattern = "yyMMDD";
+        String pattern = "yyMMdd";
         YearMonthDayGroupBySupplier supplier = new YearMonthDayGroupBySupplier(pattern);
         GroupedKey groupedKey = supplier.get();
         assertEquals(groupedKey.getKey(), LocalDate.now().format(DateTimeFormatter.ofPattern(pattern)));
diff --git a/examples/cosid-example-redis/src/main/resources/application.yaml b/examples/cosid-example-redis/src/main/resources/application.yaml
index 63591c300a..ee16b78a3f 100644
--- a/examples/cosid-example-redis/src/main/resources/application.yaml
+++ b/examples/cosid-example-redis/src/main/resources/application.yaml
@@ -88,6 +88,31 @@ cosid:
       group_year_biz:
         group:
           by: year
+          pattern: yyyy
+        converter:
+          type: to_string
+          to-string:
+            pad-start: true
+            char-size: 8
+          prefix: BIZ-
+          group-prefix:
+            enabled: true
+      group_year_month_biz:
+        group:
+          by: year_month
+          pattern: yyyyMM
+        converter:
+          type: to_string
+          to-string:
+            pad-start: true
+            char-size: 8
+          prefix: BIZ-
+          group-prefix:
+            enabled: true
+      group_year_month_day_biz:
+        group:
+          by: year_month_day
+          pattern: yyyyMMdd
         converter:
           type: to_string
           to-string:
@@ -96,7 +121,6 @@ cosid:
           prefix: BIZ-
           group-prefix:
             enabled: true
-
 logging:
   level:
     me.ahoo.cosid: debug