diff --git a/config/dpkg/changelog b/config/dpkg/changelog
index 9787deb..7c187a0 100644
--- a/config/dpkg/changelog
+++ b/config/dpkg/changelog
@@ -1,5 +1,5 @@
-dfdatetime (20220905-1) unstable; urgency=low
+dfdatetime (20220925-1) unstable; urgency=low
 
   * Auto-generated
 
- -- Log2Timeline maintainers <log2timeline-maintainers@googlegroups.com>  Mon, 05 Sep 2022 17:54:00 +0200
+ -- Log2Timeline maintainers <log2timeline-maintainers@googlegroups.com>  Sun, 25 Sep 2022 07:15:50 +0200
diff --git a/dfdatetime/__init__.py b/dfdatetime/__init__.py
index 53161e0..68e91d9 100644
--- a/dfdatetime/__init__.py
+++ b/dfdatetime/__init__.py
@@ -25,4 +25,4 @@
 from dfdatetime import webkit_time
 
 
-__version__ = '20220905'
+__version__ = '20220925'
diff --git a/dfdatetime/interface.py b/dfdatetime/interface.py
index 77e22ee..e773edb 100644
--- a/dfdatetime/interface.py
+++ b/dfdatetime/interface.py
@@ -896,10 +896,10 @@ def CopyToDateTimeStringISO8601(self):
       if self._time_zone_offset is not None or not self.is_local_time:
         time_zone_offset_hours, time_zone_offset_minutes = divmod(
             self._time_zone_offset or 0, 60)
-        if time_zone_offset_hours > 0:
-          time_zone_offset_sign = '-'
-        else:
+        if time_zone_offset_hours >= 0:
           time_zone_offset_sign = '+'
+        else:
+          time_zone_offset_sign = '-'
           time_zone_offset_hours *= -1
 
         time_zone_string = (
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 81e7973..e872a91 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,6 +1,6 @@
 docutils
 Markdown
 recommonmark
-sphinx >= 4.1.0
+sphinx >= 4.1.0, < 5.2.0
 sphinx-markdown-tables
 sphinx-rtd-theme >= 0.5.1
diff --git a/tests/time_elements.py b/tests/time_elements.py
index 915886c..613c82e 100644
--- a/tests/time_elements.py
+++ b/tests/time_elements.py
@@ -649,14 +649,14 @@ def testCopyToDateTimeStringISO8601(self):
 
     time_elements_object = time_elements.TimeElements(
         time_elements_tuple=(2010, 8, 12, 20, 6, 31),
-        time_zone_offset=-120)
+        time_zone_offset=120)
 
     date_time_string = time_elements_object.CopyToDateTimeStringISO8601()
     self.assertEqual(date_time_string, '2010-08-12T20:06:31+02:00')
 
     time_elements_object = time_elements.TimeElements(
         time_elements_tuple=(2010, 8, 12, 20, 6, 31),
-        time_zone_offset=300)
+        time_zone_offset=-300)
 
     date_time_string = time_elements_object.CopyToDateTimeStringISO8601()
     self.assertEqual(date_time_string, '2010-08-12T20:06:31-05:00')