diff --git a/tests/test_templates.py b/tests/test_templates.py
index 6e8c729a6..e91fee3b2 100644
--- a/tests/test_templates.py
+++ b/tests/test_templates.py
@@ -1162,9 +1162,9 @@ def test_age_in_working_days_settings(settings, pub, freezer):
     assert t.render({'value': '2020-07-12'}) == '2'
     settings.WORKING_DAY_CALENDAR = 'workalendar.europe.France'
     t = Template('{{ value|age_in_working_days }}')
-    assert t.render({'value': '2020-07-12'}) == '7'
+    assert t.render({'value': '2020-07-12'}) == '-7'
     t = Template('{{ value|age_in_working_days_with_saturday }}')
-    assert t.render({'value': '2020-07-12'}) == '9'
+    assert t.render({'value': '2020-07-12'}) == '-9'
 
     pub.site_options.set('options', 'working_day_calendar', 'foobar')
     with open(os.path.join(pub.app_dir, 'site-options.cfg'), 'w') as fd:
diff --git a/wcs/qommon/templatetags/qommon.py b/wcs/qommon/templatetags/qommon.py
index 07c416bbf..860f081d1 100644
--- a/wcs/qommon/templatetags/qommon.py
+++ b/wcs/qommon/templatetags/qommon.py
@@ -482,7 +482,10 @@ def age_in_working_days(value, arg=None, saturday_is_a_working_day=False):
     if not cal:
         return ''
 
-    return cal.get_working_days_delta(value, arg)
+    delta = cal.get_working_days_delta(value, arg)
+    if arg.timetuple() < value.timetuple():
+        delta = -delta
+    return delta
 
 
 @register.filter(expects_localtime=True)