fix(dataflows): include the analysis day in the Alpha Vantage news window

- time_to was midnight starting the end date, dropping that day's news

tests/test_alpha_vantage_hardening.py

@@ -166,3 +166,20 @@ def test_global_news_omitted_optionals_use_the_configured_defaults(monkeypatch):
     alpha_vantage_news.get_global_news("2026-08-14", None, None)
 
     assert seen["time_from"].startswith("20260811") and seen["limit"] == "9"
+
+
+@pytest.mark.unit
+def test_the_news_window_includes_the_analysis_day(monkeypatch):
+    """time_to was midnight at the start of the end date, so everything
+    published during the analysis day, the most decision-relevant day, was
+    excluded. The yfinance path includes it."""
+    from tradingagents.dataflows import alpha_vantage_news
+
+    seen = {}
+    monkeypatch.setattr(alpha_vantage_news, "_make_api_request",
+                        lambda fn, params: seen.update(params) or "{}")
+
+    alpha_vantage_news.get_news("AAPL", "2026-03-10", "2026-03-14")
+
+    assert seen["time_from"] == "20260310T0000"
+    assert seen["time_to"] == "20260314T2359"

tradingagents/dataflows/alpha_vantage_common.py

@@ -34,8 +34,13 @@ def get_api_key() -> str:
         )
     return api_key
 
-def format_datetime_for_api(date_input) -> str:
-    """Convert various date formats to YYYYMMDDTHHMM format required by Alpha Vantage API."""
+def format_datetime_for_api(date_input, end_of_day: bool = False) -> str:
+    """Convert various date formats to the YYYYMMDDTHHMM Alpha Vantage expects.
+
+    A plain date means midnight, which is the start of that day. For the end of
+    a window pass ``end_of_day`` so the day itself is inside it, rather than
+    dropping everything published on the analysis date.
+    """
     if isinstance(date_input, str):
         # If already in correct format, return as-is
         if len(date_input) == 13 and 'T' in date_input:
@@ -43,7 +48,7 @@ def format_datetime_for_api(date_input) -> str:
         # Try to parse common date formats
         try:
             dt = datetime.strptime(date_input, "%Y-%m-%d")
-            return dt.strftime("%Y%m%dT0000")
+            return dt.strftime("%Y%m%dT2359" if end_of_day else "%Y%m%dT0000")
         except ValueError:
             try:
                 dt = datetime.strptime(date_input, "%Y-%m-%d %H:%M")

tradingagents/dataflows/alpha_vantage_news.py

@@ -21,7 +21,7 @@ def get_news(ticker, start_date, end_date) -> dict[str, str] | str:
     params = {
         "tickers": ticker,
         "time_from": format_datetime_for_api(start_date),
-        "time_to": format_datetime_for_api(end_date),
+        "time_to": format_datetime_for_api(end_date, end_of_day=True),
     }
 
     return _make_api_request("NEWS_SENTIMENT", params)
@@ -56,7 +56,7 @@ def get_global_news(curr_date, look_back_days: int | None = None, limit: int | N
     params = {
         "topics": "financial_markets,economy_macro,economy_monetary",
         "time_from": format_datetime_for_api(start_date),
-        "time_to": format_datetime_for_api(curr_date),
+        "time_to": format_datetime_for_api(curr_date, end_of_day=True),
         "limit": str(limit),
     }