urlinfo:generic: use python-dateutil for date parsing

docker/requirements.txt

@@ -1,5 +1,6 @@
 feedparser==6.*
 matrix-nio[e2e]
+python-dateutil
 pyyaml
 requests
 youtube_dl

hotdog/command/urlinfo_/generic.py

@@ -1,9 +1,11 @@
 import json
 import logging
 from dataclasses import dataclass
-from datetime import datetime, timezone
+from datetime import datetime
 from typing import *
 
+import dateutil.parser
+
 from ...functions import (
     ElementParser,
     capped_text,
@@ -149,20 +151,7 @@ def aslist(o: Any):
 
 
 def fromisoformat(s) -> datetime:
-    try:
-        return datetime.fromisoformat(s)
-    except ValueError:
-        pass
-    formats = (
-        r"%Y-%m-%dT%H:%M:%SZ",  # '2003-08-15T13:18:27Z', found at ???
-        r"%Y-%m-%dT%H:%M:%S.000Z",  # '2020-12-03T18:42:00.000Z', found at wsj
-    )
-    for fmt in formats:
-        try:
-            return datetime.strptime(s, fmt).replace(tzinfo=timezone.utc)
-        except ValueError as e:
-            pass
-    raise e
+    return dateutil.parser.isoparse(s)
 
 
 def name_from_thing(p: Union[Mapping, str]) -> Optional[str]: