Merge pull request #1448 from ivan23kor/feature/clarify-end-argument

Clarify that interval is [start; end) in docstrings

Author: ValueRaider

yfinance/base.py

@@ -556,11 +556,13 @@ def history(self, period="1mo", interval="1d",
                 Valid intervals: 1m,2m,5m,15m,30m,60m,90m,1h,1d,5d,1wk,1mo,3mo
                 Intraday data cannot extend last 60 days
             start: str
-                Download start date string (YYYY-MM-DD) or _datetime.
+                Download start date string (YYYY-MM-DD) or _datetime, inclusive.
                 Default is 1900-01-01
+                E.g. for start="2020-01-01", the first data point will be on "2020-01-01"
             end: str
-                Download end date string (YYYY-MM-DD) or _datetime.
+                Download end date string (YYYY-MM-DD) or _datetime, exclusive.
                 Default is now
+                E.g. for end="2023-01-01", the last data point will be on "2022-12-31"
             prepost : bool
                 Include Pre and Post market data in results?
                 Default is False

yfinance/multi.py

@@ -44,11 +44,13 @@ def download(tickers, start=None, end=None, actions=False, threads=True, ignore_
             Valid intervals: 1m,2m,5m,15m,30m,60m,90m,1h,1d,5d,1wk,1mo,3mo
             Intraday data cannot extend last 60 days
         start: str
-            Download start date string (YYYY-MM-DD) or _datetime.
+            Download start date string (YYYY-MM-DD) or _datetime, inclusive.
             Default is 1900-01-01
+            E.g. for start="2020-01-01", the first data point will be on "2020-01-01"
         end: str
-            Download end date string (YYYY-MM-DD) or _datetime.
+            Download end date string (YYYY-MM-DD) or _datetime, exclusive.
             Default is now
+            E.g. for end="2023-01-01", the last data point will be on "2022-12-31"
         group_by : str
             Group by 'ticker' or 'column' (default)
         prepost : bool