diff --git a/module/holiday/model.php b/module/holiday/model.php
index b56566483d..bf9047069d 100644
--- a/module/holiday/model.php
+++ b/module/holiday/model.php
@@ -275,13 +275,14 @@ class holidayModel extends model
     }
 
     /**
+     * 判断一天是否是工作日。
      * Judge if is working days.
      *
      * @param  string $date
      * @access public
      * @return bool
      */
-    public function isWorkingDay($date)
+    public function isWorkingDay(string $date): bool
     {
         $record = $this->dao->select('*')->from(TABLE_HOLIDAY)
             ->where('type')->eq('working')
diff --git a/module/holiday/test/holiday.class.php b/module/holiday/test/holiday.class.php
index d0996daf16..81dbc85823 100644
--- a/module/holiday/test/holiday.class.php
+++ b/module/holiday/test/holiday.class.php
@@ -233,19 +233,21 @@ class holidayTest
     }
 
     /**
-     * Test isWorkingDay method.
+     * 测试某天是否是工作日。
+     * Test judge if is a working day.
      *
-     * @param  string    $date
+     * @param  string       $date
      * @access public
-     * @return object
+     * @return string|array
      */
-    public function isWorkingDayTest($date)
+    public function isWorkingDayTest(string $date): string|array
     {
+        $date = !empty($date) ? date('Y-m-d', strtotime($date)) : '0000-00-00';
         $objects = $this->objectModel->isWorkingDay($date);
 
         if(dao::isError()) return dao::getError();
 
-        return $objects;
+        return $objects === true ? 'It is a working day' : 'It is not a working day';
     }
 
     /**
diff --git a/module/holiday/test/model/isworkingday.php b/module/holiday/test/model/isworkingday.php
index 6d17dd89e4..de3514ae63 100755
--- a/module/holiday/test/model/isworkingday.php
+++ b/module/holiday/test/model/isworkingday.php
@@ -1,7 +1,12 @@
 #!/usr/bin/env php
 <?php
+declare(strict_types=1);
 include dirname(__FILE__, 5) . '/test/lib/init.php';
 include dirname(__FILE__, 2) . '/holiday.class.php';
+
+zdTable('holiday')->gen(10);
+zdTable('user')->gen(1);
+
 su('admin');
 
 /**
@@ -17,8 +22,8 @@ pid=1
 */
 
 $holiday = new holidayTest();
-$date    = array('2022-03-01', '2022-04-09', '2002-2-2');
+$date    = array('-1 month', '-1 month +3 day', '');
 
-r($holiday->isWorkingDayTest($date[0])) && p() && e('0'); // 测试不是工作日
-r($holiday->isWorkingDayTest($date[1])) && p() && e('1'); // 测试是工作日
-r($holiday->isWorkingDayTest($date[2])) && p() && e('0'); // 测试日期格式不对
\ No newline at end of file
+r($holiday->isWorkingDayTest($date[0])) && p() && e('It is not a working day'); // 测试不是工作日
+r($holiday->isWorkingDayTest($date[1])) && p() && e('It is a working day');     // 测试是工作日
+r($holiday->isWorkingDayTest($date[2])) && p() && e('It is not a working day'); // 测试日期格式不对