diff --git a/pyexcel_xls/__init__.py b/pyexcel_xls/__init__.py
index 36c9adf..c1d855e 100644
--- a/pyexcel_xls/__init__.py
+++ b/pyexcel_xls/__init__.py
@@ -117,7 +117,9 @@ def write_row(self, array):
             value = array[i]
             style = None
             tmp_array = []
-            if isinstance(value, datetime.date) or isinstance(value, datetime.datetime):
+            is_date_type = (isinstance(value, datetime.date) or
+                            isinstance(value, datetime.datetime))
+            if is_date_type:
                 tmp_array = [value.year, value.month, value.day]
                 value = xlrd.xldate.xldate_from_date_tuple(tmp_array, 0)
                 style = XFStyle()
@@ -167,4 +169,4 @@ def close(self):
     # to allow this module to function independently
     pass
 
-__VERSION__ = "0.0.1"
\ No newline at end of file
+__VERSION__ = "0.0.3"
diff --git a/setup.py b/setup.py
index 1a41af6..4d92f60 100644
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@
 setup(
     name='pyexcel-xls',
     author="C. W.",
-    version='0.0.2',
+    version='0.0.3',
     author_email="wangc_2011@hotmail.com",
     url="https://github.com/chfw/pyexcel-xls",
     description='A wrapper library to read, manipulate and write data in xls format. It reads xlsx and xlsm format',