Re-adding #78 from Dahlia.

Author: TkTech

flask_babel/__init__.py

@@ -426,7 +426,8 @@ def format_time(time=None, format=None, rebase=True):
     return _date_format(dates.format_time, time, format, rebase)
 
 
-def format_timedelta(datetime_or_timedelta, granularity='second'):
+def format_timedelta(datetime_or_timedelta, granularity='second',
+                     add_direction=False):
     """Format the elapsed time from the given date to now or the given
     timedelta.  This currently requires an unreleased development
     version of Babel.
@@ -436,8 +437,12 @@ def format_timedelta(datetime_or_timedelta, granularity='second'):
     """
     if isinstance(datetime_or_timedelta, datetime):
         datetime_or_timedelta = datetime.utcnow() - datetime_or_timedelta
-    return dates.format_timedelta(datetime_or_timedelta, granularity,
-                                  locale=get_locale())
+    return dates.format_timedelta(
+        datetime_or_timedelta,
+        granularity,
+        add_direction=add_direction,
+        locale=get_locale()
+    )
 
 
 def _date_format(formatter, obj, format, rebase, **extra):