diff --git a/library/think/cache/driver/File.php b/library/think/cache/driver/File.php
index 04d8c4a6..f02f6e7a 100644
--- a/library/think/cache/driver/File.php
+++ b/library/think/cache/driver/File.php
@@ -129,7 +129,7 @@ class File extends Driver
      * @access public
      * @param string            $name 缓存变量名
      * @param mixed             $value  存储数据
-     * @param integer|DateTime  $expire  有效时间（秒）
+     * @param integer|\DateTime $expire  有效时间（秒）
      * @return boolean
      */
     public function set($name, $value, $expire = null)
diff --git a/library/think/cache/driver/Lite.php b/library/think/cache/driver/Lite.php
index ca69489f..2e541851 100644
--- a/library/think/cache/driver/Lite.php
+++ b/library/think/cache/driver/Lite.php
@@ -93,7 +93,7 @@ class Lite extends Driver
      * @access   public
      * @param string            $name 缓存变量名
      * @param mixed             $value  存储数据
-     * @param integer|DateTime  $expire  有效时间（秒）
+     * @param integer|\DateTime $expire  有效时间（秒）
      * @return bool
      */
     public function set($name, $value, $expire = null)
diff --git a/library/think/cache/driver/Memcache.php b/library/think/cache/driver/Memcache.php
index 816e5a93..dcedec36 100644
--- a/library/think/cache/driver/Memcache.php
+++ b/library/think/cache/driver/Memcache.php
@@ -84,7 +84,7 @@ class Memcache extends Driver
      * @access public
      * @param string            $name 缓存变量名
      * @param mixed             $value  存储数据
-     * @param integer|DateTime  $expire  有效时间（秒）
+     * @param integer|\DateTime $expire  有效时间（秒）
      * @return bool
      */
     public function set($name, $value, $expire = null)
diff --git a/library/think/cache/driver/Memcached.php b/library/think/cache/driver/Memcached.php
index 6232fd80..1032e254 100644
--- a/library/think/cache/driver/Memcached.php
+++ b/library/think/cache/driver/Memcached.php
@@ -95,7 +95,7 @@ class Memcached extends Driver
      * @access public
      * @param string            $name 缓存变量名
      * @param mixed             $value  存储数据
-     * @param integer|DateTime  $expire  有效时间（秒）
+     * @param integer|\DateTime $expire  有效时间（秒）
      * @return bool
      */
     public function set($name, $value, $expire = null)
diff --git a/library/think/cache/driver/Redis.php b/library/think/cache/driver/Redis.php
index d2bba3ed..2b05dcc0 100644
--- a/library/think/cache/driver/Redis.php
+++ b/library/think/cache/driver/Redis.php
@@ -93,7 +93,7 @@ class Redis extends Driver
      * @access public
      * @param string            $name 缓存变量名
      * @param mixed             $value  存储数据
-     * @param integer|DateTime  $expire  有效时间（秒）
+     * @param integer|\DateTime $expire  有效时间（秒）
      * @return boolean
      */
     public function set($name, $value, $expire = null)
diff --git a/library/think/cache/driver/Sqlite.php b/library/think/cache/driver/Sqlite.php
index 74f0b66f..dd7cc957 100644
--- a/library/think/cache/driver/Sqlite.php
+++ b/library/think/cache/driver/Sqlite.php
@@ -98,7 +98,7 @@ class Sqlite extends Driver
      * @access public
      * @param string            $name 缓存变量名
      * @param mixed             $value  存储数据
-     * @param integer|DateTime  $expire  有效时间（秒）
+     * @param integer|\DateTime $expire  有效时间（秒）
      * @return boolean
      */
     public function set($name, $value, $expire = null)
diff --git a/library/think/cache/driver/Wincache.php b/library/think/cache/driver/Wincache.php
index aa56f6a7..77b8722d 100644
--- a/library/think/cache/driver/Wincache.php
+++ b/library/think/cache/driver/Wincache.php
@@ -70,7 +70,7 @@ class Wincache extends Driver
      * @access public
      * @param string            $name 缓存变量名
      * @param mixed             $value  存储数据
-     * @param integer|DateTime  $expire  有效时间（秒）
+     * @param integer|\DateTime $expire  有效时间（秒）
      * @return boolean
      */
     public function set($name, $value, $expire = null)
diff --git a/library/think/cache/driver/Xcache.php b/library/think/cache/driver/Xcache.php
index c0b3a64c..06754445 100644
--- a/library/think/cache/driver/Xcache.php
+++ b/library/think/cache/driver/Xcache.php
@@ -70,7 +70,7 @@ class Xcache extends Driver
      * @access public
      * @param string            $name 缓存变量名
      * @param mixed             $value  存储数据
-     * @param integer|DateTime  $expire  有效时间（秒）
+     * @param integer|\DateTime $expire  有效时间（秒）
      * @return boolean
      */
     public function set($name, $value, $expire = null)
diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index 527008a5..a5072fc8 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -1446,18 +1446,19 @@ class Query
     /**
      * 查询缓存
      * @access public
-     * @param mixed   $key    缓存key
-     * @param integer $expire 缓存有效期
-     * @param string  $tag    缓存标签
+     * @param mixed             $key    缓存key
+     * @param integer|\DateTime $expire 缓存有效期
+     * @param string            $tag    缓存标签
      * @return $this
      */
     public function cache($key = true, $expire = null, $tag = null)
     {
         // 增加快捷调用方式 cache(10) 等同于 cache(true, 10)
-        if (is_numeric($key) && is_null($expire)) {
+        if ($key instanceof \DateTime || (is_numeric($key) && is_null($expire))) {
             $expire = $key;
             $key    = true;
         }
+
         if (false !== $key) {
             $this->options['cache'] = ['key' => $key, 'expire' => $expire, 'tag' => $tag];
         }