diff --git a/AUTHORS.rst b/AUTHORS.rst
index 1dee23ddc..77a2e984e 100644
--- a/AUTHORS.rst
+++ b/AUTHORS.rst
@@ -161,3 +161,4 @@ Contributors (chronological)
 - Stephen Eaton `@madeinoz67 <https://github.com/madeinoz67>`_
 - Antonio Lassandro `@lassandroan <https://github.com/lassandroan>`_
 - Javier Fernández `@jfernandz <https://github.com/jfernandz>`_
+- Felix Claessen `@flix6x <https://github.com/flix6x>`_
diff --git a/src/marshmallow/utils.py b/src/marshmallow/utils.py
index cb5e5002d..b231bf0c6 100644
--- a/src/marshmallow/utils.py
+++ b/src/marshmallow/utils.py
@@ -117,7 +117,7 @@ def rfcformat(datetime: dt.datetime) -> str:
     r"(?P<year>\d{4})-(?P<month>\d{1,2})-(?P<day>\d{1,2})"
     r"[T ](?P<hour>\d{1,2}):(?P<minute>\d{1,2})"
     r"(?::(?P<second>\d{1,2})(?:\.(?P<microsecond>\d{1,6})\d{0,6})?)?"
-    r"(?P<tzinfo>Z|[+-]\d{2}(?::?\d{2})?)?$"
+    r"(?P<tzinfo>Z|[ +-]\d{2}(?::?\d{2})?)?$"
 )
 
 _iso8601_date_re = re.compile(r"(?P<year>\d{4})-(?P<month>\d{1,2})-(?P<day>\d{1,2})$")
diff --git a/tests/base.py b/tests/base.py
index 707708cf8..4dd5a67e8 100644
--- a/tests/base.py
+++ b/tests/base.py
@@ -10,6 +10,7 @@
 from marshmallow.exceptions import ValidationError
 
 central = pytz.timezone("US/Central")
+adam = pytz.timezone("Europe/Amsterdam")
 
 
 ALL_FIELDS = [
diff --git a/tests/test_deserialization.py b/tests/test_deserialization.py
index 911cb1743..095364bcb 100644
--- a/tests/test_deserialization.py
+++ b/tests/test_deserialization.py
@@ -3,6 +3,7 @@
 import ipaddress
 import decimal
 import math
+from urllib import parse
 
 import pytest
 
@@ -10,7 +11,7 @@
 from marshmallow.exceptions import ValidationError
 from marshmallow.validate import Equal
 
-from tests.base import assert_date_equal, assert_time_equal, central, ALL_FIELDS
+from tests.base import assert_date_equal, assert_time_equal, adam, central, ALL_FIELDS
 
 
 class TestDeserializingNone:
@@ -456,6 +457,11 @@ def test_custom_date_format_datetime_field_deserialization(self):
                 central.localize(dt.datetime(2013, 11, 10, 1, 23, 45), is_dst=False),
                 True,
             ),
+            (
+                "Sun, 10 Nov 2013 01:23:45 +0100",
+                adam.localize(dt.datetime(2013, 11, 10, 1, 23, 45), is_dst=False),
+                True,
+            ),
         ],
     )
     def test_rfc_datetime_field_deserialization(self, fmt, value, expected, aware):
@@ -500,6 +506,21 @@ def test_rfc_datetime_field_deserialization(self, fmt, value, expected, aware):
                 central.localize(dt.datetime(2013, 11, 10, 1, 23, 45), is_dst=False),
                 True,
             ),
+            (
+                parse.unquote_plus("2013-11-10T01:23:45-06:00"),
+                central.localize(dt.datetime(2013, 11, 10, 1, 23, 45), is_dst=False),
+                True,
+            ),
+            (
+                "2013-11-10T01:23:45+01:00",
+                adam.localize(dt.datetime(2013, 11, 10, 1, 23, 45), is_dst=False),
+                True,
+            ),
+            (
+                parse.unquote_plus("2013-11-10T01:23:45+01:00"),
+                adam.localize(dt.datetime(2013, 11, 10, 1, 23, 45), is_dst=False),
+                True,
+            ),
         ],
     )
     def test_iso_datetime_field_deserialization(self, fmt, value, expected, aware):
@@ -558,7 +579,7 @@ def test_naive_datetime_with_timezone(self, fmt, timezone, value, expected):
         field = fields.NaiveDateTime(format=fmt, timezone=timezone)
         assert field.deserialize(value) == expected
 
-    @pytest.mark.parametrize("timezone", (dt.timezone.utc, central))
+    @pytest.mark.parametrize("timezone", (dt.timezone.utc, central, adam))
     @pytest.mark.parametrize(
         ("fmt", "value"),
         [("iso", "2013-11-10T01:23:45"), ("rfc", "Sun, 10 Nov 2013 01:23:45")],