diff --git a/httprunner/__about__.py b/httprunner/__about__.py
index 792bf03a..a5a8532d 100644
--- a/httprunner/__about__.py
+++ b/httprunner/__about__.py
@@ -1,7 +1,7 @@
 __title__ = 'HttpRunner'
 __description__ = 'One-stop solution for HTTP(S) testing.'
 __url__ = 'https://github.com/HttpRunner/HttpRunner'
-__version__ = '1.5.2'
+__version__ = '1.5.3'
 __author__ = 'debugtalk'
 __author_email__ = 'mail@debugtalk.com'
 __license__ = 'MIT'
diff --git a/httprunner/report.py b/httprunner/report.py
index 7b5220db..23b2bd64 100644
--- a/httprunner/report.py
+++ b/httprunner/report.py
@@ -49,7 +49,7 @@ def get_summary(result):
 
     if getattr(result, "records", None):
         summary["time"] = {
-            'start_at': datetime.fromtimestamp(result.start_at),
+            'start_at': result.start_at,
             'duration': result.duration
         }
         summary["records"] = result.records
@@ -77,14 +77,15 @@ def render_html_report(summary, html_report_name=None, html_report_template=None
     logger.log_debug("render data: {}".format(summary))
 
     report_dir_path = os.path.join(os.getcwd(), "reports")
-    start_datetime = summary["time"]["start_at"].strftime('%Y-%m-%d-%H-%M-%S')
+    start_at_timestamp = int(summary["time"]["start_at"])
+    summary["time"]["start_datetime"] = datetime.fromtimestamp(start_at_timestamp).strftime('%Y-%m-%d %H:%M:%S')
     if html_report_name:
         summary["html_report_name"] = html_report_name
         report_dir_path = os.path.join(report_dir_path, html_report_name)
-        html_report_name += "-{}.html".format(start_datetime)
+        html_report_name += "-{}.html".format(start_at_timestamp)
     else:
         summary["html_report_name"] = ""
-        html_report_name = "{}.html".format(start_datetime)
+        html_report_name = "{}.html".format(start_at_timestamp)
 
     if not os.path.isdir(report_dir_path):
         os.makedirs(report_dir_path)
diff --git a/httprunner/templates/default_report_template.html b/httprunner/templates/default_report_template.html
index e72587b0..06941c1a 100644
--- a/httprunner/templates/default_report_template.html
+++ b/httprunner/templates/default_report_template.html
@@ -150,7 +150,7 @@
 
     <tr>
       <th>START AT</th>
-      <td colspan="4">{{time.start_at.strftime('%Y-%m-%d %H:%M:%S')}}</td>
+      <td colspan="4">{{time.start_datetime}}</td>
     </tr>
     <tr>
       <th>DURATION</th>