fix mid level issues. updated changelog

bincio/extract/parsers/tcx.py

@@ -87,11 +87,24 @@ class TcxParser:
 
 
 def _parse_ts(s: str) -> datetime:
-    # ISO 8601 with or without fractional seconds
-    s = s.rstrip("Z")
-    for fmt in ("%Y-%m-%dT%H:%M:%S.%f", "%Y-%m-%dT%H:%M:%S"):
-        try:
-            return datetime.strptime(s, fmt).replace(tzinfo=timezone.utc)
-        except ValueError:
-            continue
+    # ISO 8601 with or without fractional seconds, with Z or numeric offset (+02:00)
+    import re as _re
+    # Strip trailing Z → assume UTC
+    if s.endswith("Z"):
+        s = s[:-1]
+        for fmt in ("%Y-%m-%dT%H:%M:%S.%f", "%Y-%m-%dT%H:%M:%S"):
+            try:
+                return datetime.strptime(s, fmt).replace(tzinfo=timezone.utc)
+            except ValueError:
+                continue
+    # Numeric offset like +02:00 or -05:30 — parse with %z then convert to UTC
+    m = _re.match(r"^(.+)([+-]\d{2}:\d{2})$", s)
+    if m:
+        body, off = m.group(1), m.group(2).replace(":", "")
+        for fmt in ("%Y-%m-%dT%H:%M:%S.%f", "%Y-%m-%dT%H:%M:%S"):
+            try:
+                dt = datetime.strptime(body + off, fmt + "%z")
+                return dt.astimezone(timezone.utc).replace(tzinfo=timezone.utc)
+            except ValueError:
+                continue
     raise ValueError(f"Cannot parse timestamp: {s!r}")