Keep the minutes of a four-digit W3C timezone offset

changelog.d/20261001_w3dtf_hhmm.rst

@@ -0,0 +1,7 @@
+Fixed
+-----
+
+*   Keep the minutes of a four-digit timezone offset in W3C dates.
+
+    ``2003-12-31T10:14:55+0530`` was read as +05:00.
+    ``+05:30`` is unchanged.

feedparser/datetimes/w3dtf.py

@@ -99,9 +99,16 @@ def _parse_date_w3dtf(datestr):
     # minutes and seconds, if missing, will default to 0.
     time.extend(["0"] * (3 - len(time)))
     if parts[2][:1] in ("-", "+"):
+        rest = parts[2][1:]
         try:
-            tzhour = int(parts[2][1:3])
-            tzmin = int(parts[2][4:])
+            # ``+0530`` has no colon, so the minutes are the last two digits.
+            # ``+05:30`` keeps the colon between the hours and the minutes.
+            if len(rest) == 4 and rest.isdigit():
+                tzhour = int(rest[:2])
+                tzmin = int(rest[2:])
+            else:
+                tzhour = int(rest[:2])
+                tzmin = int(rest[3:])
         except ValueError:
             return None
         if parts[2].startswith("-"):

tests/test_date_parsers.py

@@ -254,6 +254,16 @@ def test_year_10000_date():
             "2003-12-31T18:14:55+08:00",
             (2003, 12, 31, 10, 14, 55, 2, 365, 0),
         ),  # Tokyo timezone
+        (
+            _parse_date_w3dtf,
+            "2003-12-31T10:14:55+0530",
+            (2003, 12, 31, 4, 44, 55, 2, 365, 0),
+        ),  # +hhmm, same offset as +05:30
+        (
+            _parse_date_w3dtf,
+            "2003-12-31T10:14:55-0530",
+            (2003, 12, 31, 15, 44, 55, 2, 365, 0),
+        ),  # -hhmm, same offset as -05:30
         (
             _parse_date_w3dtf,
             "2007-04-23T23:25:47.538+10:00",