diff --git a/commons/web-common/src/main/java/com/schbrain/common/web/support/converter/datetime/DateTimeConditionalConverter.java b/commons/web-common/src/main/java/com/schbrain/common/web/support/converter/datetime/DateTimeConditionalConverter.java
index 45e54bb32b8e72dec590e4c735e1f573d1d62444..44b14cfb0267c02291cb25f2e09699b472898db6 100644
--- a/commons/web-common/src/main/java/com/schbrain/common/web/support/converter/datetime/DateTimeConditionalConverter.java
+++ b/commons/web-common/src/main/java/com/schbrain/common/web/support/converter/datetime/DateTimeConditionalConverter.java
@@ -23,7 +23,7 @@ abstract class DateTimeConditionalConverter<T> implements ConditionalGenericConv
     private final TypeDescriptor stringType = TypeDescriptor.valueOf(String.class);
     private final Map<String, DateTimeFormatter> formatters = new ConcurrentHashMap<>();
 
-    public DateTimeConditionalConverter() {
+    DateTimeConditionalConverter() {
         this.targetType = TypeDescriptor.valueOf(ResolvableType.forClass(getClass()).getSuperType().getGeneric(0).getRawClass());
     }
 
@@ -45,7 +45,7 @@ abstract class DateTimeConditionalConverter<T> implements ConditionalGenericConv
         return convert((String) source, targetType);
     }
 
-    protected final T convert(String source, TypeDescriptor targetType) {
+    protected T convert(String source, TypeDescriptor targetType) {
         if (StringUtils.isBlank(source)) {
             return null;
         }
@@ -69,14 +69,12 @@ abstract class DateTimeConditionalConverter<T> implements ConditionalGenericConv
         return pattern;
     }
 
-    protected String defaultPattern() {
-        return DatePattern.NORM_DATETIME_PATTERN;
-    }
-
     protected DateTimeFormatter ofPattern(String pattern) {
         return formatters.computeIfAbsent(pattern, ignore -> DatePattern.createFormatter(pattern));
     }
 
+    protected abstract String defaultPattern();
+
     protected abstract T doConvert(Long source);
 
     protected abstract T doConvert(String source, DateTimeFormatter formatter);
diff --git a/commons/web-common/src/main/java/com/schbrain/common/web/support/converter/datetime/StringToDateConditionalConverter.java b/commons/web-common/src/main/java/com/schbrain/common/web/support/converter/datetime/StringToDateConditionalConverter.java
index d264f4a568bc795d7cd9b8728148b203b0a9678c..e352b3f050c2283077656c729ad0c2d5170ee0a8 100644
--- a/commons/web-common/src/main/java/com/schbrain/common/web/support/converter/datetime/StringToDateConditionalConverter.java
+++ b/commons/web-common/src/main/java/com/schbrain/common/web/support/converter/datetime/StringToDateConditionalConverter.java
@@ -1,5 +1,6 @@
 package com.schbrain.common.web.support.converter.datetime;
 
+import cn.hutool.core.date.DatePattern;
 import cn.hutool.core.date.DateUtil;
 
 import java.time.format.DateTimeFormatter;
@@ -13,6 +14,11 @@ class StringToDateConditionalConverter extends DateTimeConditionalConverter<Date
 
     static final StringToDateConditionalConverter INSTANCE = new StringToDateConditionalConverter();
 
+    @Override
+    protected String defaultPattern() {
+        return DatePattern.NORM_DATETIME_PATTERN;
+    }
+
     @Override
     protected Date doConvert(Long source) {
         return DateUtil.date(source);
diff --git a/commons/web-common/src/main/java/com/schbrain/common/web/support/converter/datetime/StringToLocalDateTimeConditionalConverter.java b/commons/web-common/src/main/java/com/schbrain/common/web/support/converter/datetime/StringToLocalDateTimeConditionalConverter.java
index 413930b1f2c8df6c7f5a83aec1bdf453e9c62cbd..43aac0c8ad04f3e65d6da223229ad366c4ba44fa 100644
--- a/commons/web-common/src/main/java/com/schbrain/common/web/support/converter/datetime/StringToLocalDateTimeConditionalConverter.java
+++ b/commons/web-common/src/main/java/com/schbrain/common/web/support/converter/datetime/StringToLocalDateTimeConditionalConverter.java
@@ -1,5 +1,6 @@
 package com.schbrain.common.web.support.converter.datetime;
 
+import cn.hutool.core.date.DatePattern;
 import cn.hutool.core.date.LocalDateTimeUtil;
 
 import java.time.LocalDateTime;
@@ -13,6 +14,11 @@ class StringToLocalDateTimeConditionalConverter extends DateTimeConditionalConve
 
     static final StringToLocalDateTimeConditionalConverter INSTANCE = new StringToLocalDateTimeConditionalConverter();
 
+    @Override
+    protected String defaultPattern() {
+        return DatePattern.NORM_DATETIME_PATTERN;
+    }
+
     @Override
     protected LocalDateTime doConvert(Long source) {
         return LocalDateTimeUtil.of(source);