Displaying timezone information in HTML report (#960)

* Displaying timezone information in HTML report

* A helpber to format datetime with local timezone

* No backward compatibility with older python versions

1 files changed, 13 insertions, 0 deletions

diff --git a/coverage/backward.py b/coverage/backward.py
index 37b49167..9d1d78e5 100644
--- a/coverage/backward.py
+++ b/coverage/backward.py
@@ -9,6 +9,8 @@
 import os
 import sys
 
+from datetime import datetime
+
 from coverage import env
 
 
@@ -217,6 +219,17 @@ except ImportError:
             return self.__dict__ == other.__dict__
 
 
+def format_local_datetime(dt):
+    """Return a string with local timezone representing the date.
+    If python version is lower than 3.6, the time zone is not included.
+    """
+    try:
+        return dt.astimezone().strftime('%Y-%m-%d %H:%M %z')
+    except (TypeError, ValueError):
+        # Datetime.astimezone in Python 3.5 can not handle naive datetime
+        return dt.strftime('%Y-%m-%d %H:%M')
+
+
 def invalidate_import_caches():
     """Invalidate any import caches that may or may not exist."""
     if importlib and hasattr(importlib, "invalidate_caches"):