fix: handle negative timestamps

src/feather/client.py

@@ -4,7 +4,7 @@ from __future__ import annotations
 
 import re
 from abc import ABC, abstractmethod
-from ttrss.client import TTRClient
+from ttrss.client import TTRClient, Headline
 import google_reader
 
 from feather.config import Config
@@ -146,11 +146,19 @@ class GReaderArticle(Article):
             # several API references I've seen didn't mention canonical, but alternate seems to also be the article link (?) and should be an ok fallback
             self.article_url = item_content.alternate[0].href
 
-        self._compute_json_path()
+        self.json_path = self._get_json_path()
 
 
 ## Tiny Tiny RSS API ##
 
+# Monkey patch Headline.__init__ to skip timestamp to datetime conversion
+# Articles may have a negative timestamp and Python's datetime.fromtimestamp doesn't like that, so instead we keep the timestamp and deal with the issue in data.py/format_datetime
+def Headline_init(self, attr, client):
+    super(Headline, self).__init__(attr, client)
+
+
+Headline.__init__ = Headline_init
+
 
 class TTRSession(ClientSession):
     """Tiny Tiny RSS API client"""
@@ -234,8 +242,8 @@ class TTRArticle(Article):
 
         self.unread = article.unread
         self.title = article.title
-        self.published = article.updated.timestamp()
+        self.published = article.updated
-        self.updated = article.updated.timestamp()
+        self.updated = article.updated
         self.author = article.author
         self.summary = article.excerpt
         self.content = article.content
@@ -248,4 +256,4 @@ class TTRArticle(Article):
         self.language = article.lang
         self.image_url = article.flavor_image
 
-        self._compute_json_path()
+        self.json_path = self._get_json_path()

src/feather/data.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 import os
 import json
 from abc import ABC
-from datetime import datetime
+from datetime import datetime, timedelta
 from pathlib import Path
 from hashlib import sha256
 from tempfile import NamedTemporaryFile
@@ -40,9 +40,13 @@ def sanitize_filename(
 
 def format_datetime(config: Config, timestamp: int) -> str:
     """Format a timestamp according to the configuraiton."""
-    return datetime.fromtimestamp(timestamp, config.timezone).strftime(
+    if timestamp < 0:
-        config.time_format
+        date = datetime(1970, 1, 1, tzinfo=config.timezone) + timedelta(
-    )
+            seconds=timestamp
+        )
+    else:
+        date = datetime.fromtimestamp(timestamp, config.timezone)
+    return date.strftime(config.time_format)
 
 
 def atomic_write(path: Path, content: str):
@@ -168,13 +172,13 @@ class Article(ABC):
         d["category"] = self.category.asdict()
         return d
 
-    def _compute_json_path(self):
+    def _get_json_path(self) -> Path:
-        self.json_path = self.config.json_root / f"{self._hash_id()}.json"
+        return self.config.json_root / f"{self._hash_id()}.json"
 
     def _write_json(self, recompute_path=False):
         """Write the JSON file associated with this article. Error if it already exists."""
         if recompute_path:
-            self._compute_json_path()
+            self.json_path = self._get_json_path()
         stored_fields = (
             "id",
             "unread",